diff --git a/packages/docusaurus-plugin-client-redirects/package.json b/packages/docusaurus-plugin-client-redirects/package.json
index 269f85b80f..c632526d40 100644
--- a/packages/docusaurus-plugin-client-redirects/package.json
+++ b/packages/docusaurus-plugin-client-redirects/package.json
@@ -12,6 +12,7 @@
   },
   "license": "MIT",
   "dependencies": {
+    "@docusaurus/core": "^2.0.0-alpha.61",
     "@docusaurus/types": "^2.0.0-alpha.61",
     "@docusaurus/utils": "^2.0.0-alpha.61",
     "@hapi/joi": "^17.1.1",
diff --git a/packages/docusaurus-plugin-client-redirects/src/__tests__/normalizePluginOptions.test.ts b/packages/docusaurus-plugin-client-redirects/src/__tests__/normalizePluginOptions.test.ts
index 19ea156a22..c21fe24fd4 100644
--- a/packages/docusaurus-plugin-client-redirects/src/__tests__/normalizePluginOptions.test.ts
+++ b/packages/docusaurus-plugin-client-redirects/src/__tests__/normalizePluginOptions.test.ts
@@ -39,6 +39,7 @@ describe('normalizePluginOptions', () => {
         redirects: [{from: '/x', to: '/y'}],
       }),
     ).toEqual({
+      id: 'default',
       fromExtensions: ['exe', 'zip'],
       toExtensions: ['html'],
       createRedirects,
diff --git a/packages/docusaurus-plugin-client-redirects/src/normalizePluginOptions.ts b/packages/docusaurus-plugin-client-redirects/src/normalizePluginOptions.ts
index b5e07f6623..b05bee9f10 100644
--- a/packages/docusaurus-plugin-client-redirects/src/normalizePluginOptions.ts
+++ b/packages/docusaurus-plugin-client-redirects/src/normalizePluginOptions.ts
@@ -8,8 +8,10 @@
 import {PluginOptions, RedirectOption, UserPluginOptions} from './types';
 import * as Joi from '@hapi/joi';
 import {PathnameValidator} from './redirectValidation';
+import {DEFAULT_PLUGIN_ID} from '@docusaurus/core/lib/constants';
 
 export const DefaultPluginOptions: PluginOptions = {
+  id: DEFAULT_PLUGIN_ID, // TODO temporary
   fromExtensions: [],
   toExtensions: [],
   redirects: [],
@@ -26,6 +28,7 @@ const RedirectPluginOptionValidation = Joi.object<RedirectOption>({
 const isString = Joi.string().required().not(null);
 
 const UserOptionsSchema = Joi.object<UserPluginOptions>({
+  id: Joi.string().optional(), // TODO remove once validation  migrated to new system
   fromExtensions: Joi.array().items(isString),
   toExtensions: Joi.array().items(isString),
   redirects: Joi.array().items(RedirectPluginOptionValidation),
diff --git a/packages/docusaurus-plugin-client-redirects/src/types.ts b/packages/docusaurus-plugin-client-redirects/src/types.ts
index 15c0987e0d..32ccdfd66d 100644
--- a/packages/docusaurus-plugin-client-redirects/src/types.ts
+++ b/packages/docusaurus-plugin-client-redirects/src/types.ts
@@ -8,6 +8,7 @@
 import {Props} from '@docusaurus/types';
 
 export type PluginOptions = {
+  id: string;
   fromExtensions: string[];
   toExtensions: string[];
   redirects: RedirectOption[];
diff --git a/packages/docusaurus-plugin-content-blog/src/index.ts b/packages/docusaurus-plugin-content-blog/src/index.ts
index c77f082a7b..8a4573f596 100644
--- a/packages/docusaurus-plugin-content-blog/src/index.ts
+++ b/packages/docusaurus-plugin-content-blog/src/index.ts
@@ -28,7 +28,6 @@ import {
 import {PluginOptionSchema} from './pluginOptionSchema';
 import {
   LoadContext,
-  PluginContentLoadedActions,
   ConfigureWebpackUtils,
   Props,
   Plugin,
@@ -195,13 +194,7 @@ export default function pluginContentBlog(
       };
     },
 
-    async contentLoaded({
-      content: blogContents,
-      actions,
-    }: {
-      content: BlogContent;
-      actions: PluginContentLoadedActions;
-    }) {
+    async contentLoaded({content: blogContents, actions}) {
       if (!blogContents) {
         return;
       }
diff --git a/packages/docusaurus-plugin-debug/package.json b/packages/docusaurus-plugin-debug/package.json
index edf4a03bca..b50d3e1307 100644
--- a/packages/docusaurus-plugin-debug/package.json
+++ b/packages/docusaurus-plugin-debug/package.json
@@ -13,7 +13,8 @@
   "license": "MIT",
   "dependencies": {
     "@docusaurus/types": "^2.0.0-alpha.61",
-    "@docusaurus/utils": "^2.0.0-alpha.61"
+    "@docusaurus/utils": "^2.0.0-alpha.61",
+    "react-json-view": "^1.19.1"
   },
   "peerDependencies": {
     "@docusaurus/core": "^2.0.0",
diff --git a/packages/docusaurus-plugin-debug/src/index.ts b/packages/docusaurus-plugin-debug/src/index.ts
index 8eadee8566..1ca9d6f0e1 100644
--- a/packages/docusaurus-plugin-debug/src/index.ts
+++ b/packages/docusaurus-plugin-debug/src/index.ts
@@ -6,13 +6,20 @@
  */
 
 import {LoadContext, Plugin} from '@docusaurus/types';
-import {normalizeUrl} from '@docusaurus/utils';
-
+import {docuHash, normalizeUrl} from '@docusaurus/utils';
 import path from 'path';
 
 export default function pluginContentPages({
   siteConfig: {baseUrl},
+  generatedFilesDir,
 }: LoadContext): Plugin<void> {
+  const pluginDataDirRoot = path.join(
+    generatedFilesDir,
+    'docusaurus-plugin-debug',
+  );
+  const aliasedSource = (source: string) =>
+    `~debug/${path.relative(pluginDataDirRoot, source)}`;
+
   return {
     name: 'docusaurus-plugin-debug',
 
@@ -20,12 +27,63 @@ export default function pluginContentPages({
       return path.resolve(__dirname, '../src/theme');
     },
 
-    contentLoaded({actions: {addRoute}}) {
+    async contentLoaded({actions: {createData, addRoute}, allContent}) {
+      const allContentPath = await createData(
+        // Note that this created data path must be in sync with
+        // metadataPath provided to mdx-loader.
+        `${docuHash('docusaurus-debug-allContent')}.json`,
+        JSON.stringify(allContent, null, 2),
+      );
+
+      // Home is config (duplicate for now)
       addRoute({
         path: normalizeUrl([baseUrl, '__docusaurus/debug']),
-        component: '@theme/Debug',
+        component: '@theme/DebugConfig',
         exact: true,
       });
+
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug/config']),
+        component: '@theme/DebugConfig',
+        exact: true,
+      });
+
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug/metadata']),
+        component: '@theme/DebugMetadata',
+        exact: true,
+      });
+
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug/registry']),
+        component: '@theme/DebugRegistry',
+        exact: true,
+      });
+
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug/routes']),
+        component: '@theme/DebugRoutes',
+        exact: true,
+      });
+
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug/content']),
+        component: '@theme/DebugContent',
+        exact: true,
+        modules: {
+          allContent: aliasedSource(allContentPath),
+        },
+      });
+    },
+
+    configureWebpack() {
+      return {
+        resolve: {
+          alias: {
+            '~debug': pluginDataDirRoot,
+          },
+        },
+      };
     },
   };
 }
diff --git a/packages/docusaurus-plugin-debug/src/theme/Debug/index.js b/packages/docusaurus-plugin-debug/src/theme/Debug/index.js
deleted file mode 100644
index 49a3a9f451..0000000000
--- a/packages/docusaurus-plugin-debug/src/theme/Debug/index.js
+++ /dev/null
@@ -1,70 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import React from 'react';
-import Layout from '@theme/Layout';
-
-import registry from '@generated/registry';
-import routes from '@generated/routes';
-
-import styles from './styles.module.css';
-import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
-
-function Debug() {
-  const {siteMetadata} = useDocusaurusContext();
-  return (
-    <Layout permalink="__docusaurus/debug" title="Debug">
-      <main className={styles.Container}>
-        <section className={styles.Section}>
-          <h2>Site Metadata</h2>
-          <div>Docusaurus Version: {siteMetadata.docusaurusVersion}</div>
-          <div>
-            Site Version: {siteMetadata.siteVersion || 'No version specified'}
-          </div>
-          <h3>Plugins and themes:</h3>
-          <ul>
-            {Object.entries(siteMetadata.pluginVersions).map(
-              ([name, versionInformation]) => (
-                <li key={name}>
-                  <div>Name: {name}</div>
-                  <div>Type: {versionInformation.type}</div>
-                  {versionInformation.version && (
-                    <div>Version: {versionInformation.version}</div>
-                  )}
-                </li>
-              ),
-            )}
-          </ul>
-        </section>
-        <section className={styles.Section}>
-          <h2>Registry</h2>
-          <ul>
-            {Object.values(registry).map(([, aliasedPath, resolved]) => (
-              <li key={aliasedPath}>
-                <div>Aliased Path: {aliasedPath}</div>
-                <div>Resolved Path: {resolved}</div>
-              </li>
-            ))}
-          </ul>
-        </section>
-        <section className={styles.Section}>
-          <h2>Routes</h2>
-          <ul>
-            {routes.map(({path, exact}) => (
-              <li key={path}>
-                <div>Route: {path}</div>
-                <div>Is exact: {String(Boolean(exact))}</div>
-              </li>
-            ))}
-          </ul>
-        </section>
-      </main>
-    </Layout>
-  );
-}
-
-export default Debug;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugConfig/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugConfig/index.js
new file mode 100644
index 0000000000..99a4191bc8
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugConfig/index.js
@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import DebugLayout from '../DebugLayout';
+import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
+
+function DebugMetadata() {
+  const {siteConfig} = useDocusaurusContext();
+  return (
+    <DebugLayout>
+      <h2>Site config</h2>
+      <div>{JSON.stringify(siteConfig, null, 2)}</div>
+    </DebugLayout>
+  );
+}
+
+export default DebugMetadata;
diff --git a/packages/docusaurus-plugin-debug/src/theme/Debug/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugConfig/styles.module.css
similarity index 60%
rename from packages/docusaurus-plugin-debug/src/theme/Debug/styles.module.css
rename to packages/docusaurus-plugin-debug/src/theme/DebugConfig/styles.module.css
index 8dee72f3c8..99ba01cb77 100644
--- a/packages/docusaurus-plugin-debug/src/theme/Debug/styles.module.css
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugConfig/styles.module.css
@@ -5,13 +5,3 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-.Container {
-  display: flex;
-  flex-wrap: wrap;
-  justify-content: center;
-  margin: 1em;
-}
-
-.Section {
-  width: 500px;
-}
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugContent/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugContent/index.js
new file mode 100644
index 0000000000..c79f7899c4
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugContent/index.js
@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React, {useState} from 'react';
+
+import DebugLayout from '../DebugLayout';
+import DebugJsonView from '../DebugJsonView';
+
+const PluginInstanceContent = ({pluginId, pluginInstanceContent}) => (
+  <section style={{marginBottom: 30}}>
+    <h4>{`>> ${pluginId}`}</h4>
+    <div
+      style={{
+        marginTop: 10,
+        padding: 10,
+        border: 'thin cyan solid',
+        borderRadius: 5,
+        backgroundColor: 'lightgrey',
+      }}>
+      <DebugJsonView src={pluginInstanceContent} />
+    </div>
+  </section>
+);
+
+const PluginContent = ({pluginName, pluginContent}) => {
+  const [visible, setVisible] = useState(true);
+  return (
+    <section style={{marginBottom: 60}}>
+      <h3 onClick={() => setVisible((v) => !v)} style={{cursor: 'pointer'}}>
+        {pluginName}
+      </h3>
+      {visible && (
+        <div>
+          {Object.entries(pluginContent)
+            // filter plugin instances with no content
+            .filter(
+              ([_pluginId, pluginInstanceContent]) => !!pluginInstanceContent,
+            )
+            .map(([pluginId, pluginInstanceContent]) => {
+              return (
+                <PluginInstanceContent
+                  key={pluginId}
+                  pluginId={pluginId}
+                  pluginInstanceContent={pluginInstanceContent}
+                />
+              );
+            })}
+        </div>
+      )}
+    </section>
+  );
+};
+
+function DebugContent({allContent}) {
+  return (
+    <DebugLayout>
+      <h2>Plugin content</h2>
+      <div>
+        {Object.entries(allContent)
+          // filter plugins with no content
+          .filter(([_pluginName, pluginContent]) =>
+            Object.values(pluginContent).some(
+              (instanceContent) => !!instanceContent,
+            ),
+          )
+          .map(([pluginName, pluginContent]) => {
+            return (
+              <PluginContent
+                key={pluginName}
+                pluginName={pluginName}
+                pluginContent={pluginContent}
+              />
+            );
+          })}
+      </div>
+    </DebugLayout>
+  );
+}
+
+export default DebugContent;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugContent/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugContent/styles.module.css
new file mode 100644
index 0000000000..99ba01cb77
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugContent/styles.module.css
@@ -0,0 +1,7 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/index.js
new file mode 100644
index 0000000000..558b31c71c
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/index.js
@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import BrowserOnly from '@docusaurus/BrowserOnly';
+
+// avoids "react-json-view" to display  "root"
+const RootName = false;
+
+// Seems ReactJson does not work with SSR
+// https://github.com/mac-s-g/react-json-view/issues/121
+const BrowserOnlyReactJson = (props) => {
+  return (
+    <BrowserOnly>
+      {() => {
+        const ReactJson = require('react-json-view').default;
+        return <ReactJson {...props} />;
+      }}
+    </BrowserOnly>
+  );
+};
+
+function DebugJsonView({src}) {
+  return (
+    <BrowserOnlyReactJson
+      src={src}
+      name={RootName}
+      shouldCollapse={(field) => {
+        // By default, we collapse the json for performance reasons
+        // See https://github.com/mac-s-g/react-json-view/issues/235
+        // only the "root" is not collapsed
+        return field.name !== RootName;
+      }}
+    />
+  );
+}
+
+export default DebugJsonView;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/styles.module.css
new file mode 100644
index 0000000000..99ba01cb77
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugJsonView/styles.module.css
@@ -0,0 +1,7 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugLayout/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugLayout/index.js
new file mode 100644
index 0000000000..02c2eb7f86
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugLayout/index.js
@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Link from '@docusaurus/Link';
+// import styles from './styles.module.css';
+
+const DebugNavLink = ({to, children}) => (
+  <Link
+    style={{margin: 10}}
+    className="button button--primary"
+    isNavLink
+    activeClassName="button--active"
+    to={to}
+    exact>
+    {children}
+  </Link>
+);
+
+function DebugLayout({children}) {
+  return (
+    <div>
+      <nav style={{width: '100%', padding: 10, border: 'solid'}}>
+        <DebugNavLink to="/__docusaurus/debug">Config</DebugNavLink>
+        <DebugNavLink to="/__docusaurus/debug/metadata">Metadata</DebugNavLink>
+        <DebugNavLink to="/__docusaurus/debug/registry">Registry</DebugNavLink>
+        <DebugNavLink to="/__docusaurus/debug/routes">Routes</DebugNavLink>
+        <DebugNavLink to="/__docusaurus/debug/content">Content</DebugNavLink>
+      </nav>
+      <main style={{padding: 20}}>{children}</main>
+    </div>
+  );
+}
+
+export default DebugLayout;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugLayout/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugLayout/styles.module.css
new file mode 100644
index 0000000000..b5c0e33b4a
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugLayout/styles.module.css
@@ -0,0 +1,6 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/index.js
new file mode 100644
index 0000000000..9cb98a2e1e
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/index.js
@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import DebugLayout from '../DebugLayout';
+import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
+
+function DebugMetadata() {
+  const {siteMetadata} = useDocusaurusContext();
+  return (
+    <DebugLayout>
+      <h2>Site Metadata</h2>
+      <div>Docusaurus Version: {siteMetadata.docusaurusVersion}</div>
+      <div>
+        Site Version: {siteMetadata.siteVersion || 'No version specified'}
+      </div>
+      <h3>Plugins and themes:</h3>
+      <ul>
+        {Object.entries(siteMetadata.pluginVersions).map(
+          ([name, versionInformation]) => (
+            <li key={name}>
+              <div>Name: {name}</div>
+              <div>Type: {versionInformation.type}</div>
+              {versionInformation.version && (
+                <div>Version: {versionInformation.version}</div>
+              )}
+            </li>
+          ),
+        )}
+      </ul>
+    </DebugLayout>
+  );
+}
+
+export default DebugMetadata;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/styles.module.css
new file mode 100644
index 0000000000..99ba01cb77
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugMetadata/styles.module.css
@@ -0,0 +1,7 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/index.js
new file mode 100644
index 0000000000..f10a53a8a6
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/index.js
@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import DebugLayout from '../DebugLayout';
+import registry from '@generated/registry';
+
+function DebugRegistry() {
+  return (
+    <DebugLayout>
+      {' '}
+      <h2>Registry</h2>
+      <ul>
+        {Object.values(registry).map(([, aliasedPath, resolved]) => (
+          <li key={aliasedPath}>
+            <div>Aliased Path: {aliasedPath}</div>
+            <div>Resolved Path: {resolved}</div>
+          </li>
+        ))}
+      </ul>
+    </DebugLayout>
+  );
+}
+
+export default DebugRegistry;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/styles.module.css
new file mode 100644
index 0000000000..99ba01cb77
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugRegistry/styles.module.css
@@ -0,0 +1,7 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/index.js b/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/index.js
new file mode 100644
index 0000000000..5eedd036f4
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/index.js
@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import DebugLayout from '../DebugLayout';
+import routes from '@generated/routes';
+
+function DebugRoutes() {
+  return (
+    <DebugLayout>
+      <h2>Routes</h2>
+      <ul>
+        {routes.map(({path, exact}) => (
+          <li key={path}>
+            <div>Route: {path}</div>
+            <div>Is exact: {String(Boolean(exact))}</div>
+          </li>
+        ))}
+      </ul>
+    </DebugLayout>
+  );
+}
+
+export default DebugRoutes;
diff --git a/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/styles.module.css b/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/styles.module.css
new file mode 100644
index 0000000000..99ba01cb77
--- /dev/null
+++ b/packages/docusaurus-plugin-debug/src/theme/DebugRoutes/styles.module.css
@@ -0,0 +1,7 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
diff --git a/packages/docusaurus-preset-classic/src/index.js b/packages/docusaurus-preset-classic/src/index.js
index 894fe315c2..47f65208f1 100644
--- a/packages/docusaurus-preset-classic/src/index.js
+++ b/packages/docusaurus-preset-classic/src/index.js
@@ -11,6 +11,9 @@ module.exports = function preset(context, opts = {}) {
   const {algolia, googleAnalytics, gtag} = themeConfig;
   const isProd = process.env.NODE_ENV === 'production';
 
+  const debug =
+    typeof opts.debug !== 'undefined' ? Boolean(opts.debug) : !isProd;
+
   return {
     themes: [
       [require.resolve('@docusaurus/theme-classic'), opts.theme],
@@ -24,7 +27,7 @@ module.exports = function preset(context, opts = {}) {
       isProd &&
         googleAnalytics &&
         require.resolve('@docusaurus/plugin-google-analytics'),
-      !isProd && require.resolve('@docusaurus/plugin-debug'),
+      debug && require.resolve('@docusaurus/plugin-debug'),
       isProd && gtag && require.resolve('@docusaurus/plugin-google-gtag'),
       isProd && [require.resolve('@docusaurus/plugin-sitemap'), opts.sitemap],
     ],
diff --git a/packages/docusaurus-theme-bootstrap/src/theme/Layout/index.js b/packages/docusaurus-theme-bootstrap/src/theme/DebugLayout/index.js
similarity index 100%
rename from packages/docusaurus-theme-bootstrap/src/theme/Layout/index.js
rename to packages/docusaurus-theme-bootstrap/src/theme/DebugLayout/index.js
diff --git a/packages/docusaurus-types/src/index.d.ts b/packages/docusaurus-types/src/index.d.ts
index 14ee8dd2b9..d2b0bf4c61 100644
--- a/packages/docusaurus-types/src/index.d.ts
+++ b/packages/docusaurus-types/src/index.d.ts
@@ -126,8 +126,15 @@ export interface PluginContentLoadedActions {
   setGlobalData<T = unknown>(data: T): void;
 }
 
+export type AllContent = Record<
+  string, // plugin name
+  Record<
+    string, // plugin id
+    unknown // plugin data
+  >
+>;
+
 export interface Plugin<T, U = unknown> {
-  id?: string;
   name: string;
   loadContent?(): Promise<T>;
   validateOptions?(): ValidationResult<U>;
@@ -136,7 +143,8 @@ export interface Plugin<T, U = unknown> {
     content,
     actions,
   }: {
-    content: T;
+    content: T; // the content loaded by this plugin instance
+    allContent: AllContent; // content loaded by ALL the plugins
     actions: PluginContentLoadedActions;
   }): void;
   routesLoaded?(routes: RouteConfig[]): void; // TODO remove soon, deprecated (alpha-60)
diff --git a/packages/docusaurus/src/server/plugins/index.ts b/packages/docusaurus/src/server/plugins/index.ts
index 619afeed6a..8d3306e3a1 100644
--- a/packages/docusaurus/src/server/plugins/index.ts
+++ b/packages/docusaurus/src/server/plugins/index.ts
@@ -9,6 +9,7 @@ import {generate} from '@docusaurus/utils';
 import fs from 'fs-extra';
 import path from 'path';
 import {
+  AllContent,
   LoadContext,
   PluginConfig,
   PluginContentLoadedActions,
@@ -17,6 +18,7 @@ import {
 import initPlugins, {InitPlugin} from './init';
 import chalk from 'chalk';
 import {DEFAULT_PLUGIN_ID} from '../../constants';
+import {chain} from 'lodash';
 
 export function sortConfig(routeConfigs: RouteConfig[]): void {
   // Sort the route config. This ensures that route with nested
@@ -68,23 +70,31 @@ export async function loadPlugins({
   // Currently plugins run lifecycle methods in parallel and are not order-dependent.
   // We could change this in future if there are plugins which need to
   // run in certain order or depend on others for data.
-  const pluginsLoadedContent = await Promise.all(
+  type ContentLoadedPlugin = {plugin: InitPlugin; content: unknown};
+  const contentLoadedPlugins: ContentLoadedPlugin[] = await Promise.all(
     plugins.map(async (plugin) => {
-      if (!plugin.loadContent) {
-        return null;
-      }
-
-      return plugin.loadContent();
+      const content = plugin.loadContent ? await plugin.loadContent() : null;
+      return {plugin, content};
     }),
   );
 
+  const allContent: AllContent = chain(contentLoadedPlugins)
+    .groupBy((item) => item.plugin.name)
+    .mapValues((nameItems) => {
+      return chain(nameItems)
+        .groupBy((item) => item.plugin.options.id ?? DEFAULT_PLUGIN_ID)
+        .mapValues((idItems) => idItems[0].content)
+        .value();
+    })
+    .value();
+
   // 3. Plugin Lifecycle - contentLoaded.
   const pluginsRouteConfigs: RouteConfig[] = [];
 
   const globalData = {};
 
   await Promise.all(
-    plugins.map(async (plugin, index) => {
+    contentLoadedPlugins.map(async ({plugin, content}) => {
       if (!plugin.contentLoaded) {
         return;
       }
@@ -100,11 +110,11 @@ export async function loadPlugins({
 
       const createData: PluginContentLoadedActions['createData'] = async (
         name,
-        content,
+        data,
       ) => {
         const modulePath = path.join(dataDir, name);
         await fs.ensureDir(path.dirname(modulePath));
-        await generate(dataDir, name, content);
+        await generate(dataDir, name, data);
         return modulePath;
       };
 
@@ -125,8 +135,9 @@ export async function loadPlugins({
       };
 
       await plugin.contentLoaded({
-        content: pluginsLoadedContent[index],
+        content,
         actions,
+        allContent,
       });
     }),
   );
diff --git a/packages/docusaurus/src/server/plugins/init.ts b/packages/docusaurus/src/server/plugins/init.ts
index 09f0e08ef5..d7e9de0e42 100644
--- a/packages/docusaurus/src/server/plugins/init.ts
+++ b/packages/docusaurus/src/server/plugins/init.ts
@@ -15,7 +15,7 @@ import {
   PluginConfig,
   DocusaurusPluginVersionInformation,
 } from '@docusaurus/types';
-import {CONFIG_FILE_NAME} from '../../constants';
+import {CONFIG_FILE_NAME, DEFAULT_PLUGIN_ID} from '../../constants';
 import {getPluginVersion} from '../versions';
 import {ensureUniquePluginInstanceIds} from './pluginIds';
 import {
@@ -79,6 +79,13 @@ export default function initPlugins({
           options: pluginOptions,
         });
         pluginOptions = normalizedOptions;
+      } else {
+        // Important to ensure all plugins have an id
+        // as we don't go through the Joi schema that adds it
+        pluginOptions = {
+          ...pluginOptions,
+          id: pluginOptions.id ?? DEFAULT_PLUGIN_ID,
+        };
       }
 
       // support both commonjs and ES modules
diff --git a/tsconfig.json b/tsconfig.json
index e0b11fc6d7..179d7409ff 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -17,10 +17,12 @@
 
     /* Additional Checks */
     "noUnusedLocals": true,
-    "noUnusedParameters": true,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
 
+    /* Disabled on purpose (handled by ESLint, should not block compilation) */
+    "noUnusedParameters": false,
+
     /* Module Resolution Options */
     "moduleResolution": "node",
     "allowSyntheticDefaultImports": true,
diff --git a/website/docusaurus.config.js b/website/docusaurus.config.js
index 191b1cec43..16f2fa3100 100644
--- a/website/docusaurus.config.js
+++ b/website/docusaurus.config.js
@@ -156,6 +156,7 @@ module.exports = {
     [
       '@docusaurus/preset-classic',
       {
+        debug: true, // force debug plugin usage
         docs: {
           // routeBasePath: '/',
           path: 'docs',
diff --git a/yarn.lock b/yarn.lock
index f8ca800f29..4cdfbdeae7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5440,6 +5440,11 @@ balanced-match@^1.0.0:
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
   integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
 
+base16@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/base16/-/base16-1.0.0.tgz#e297f60d7ec1014a7a971a39ebc8a98c0b681e70"
+  integrity sha1-4pf2DX7BAUp6lxo568ipjAtoHnA=
+
 base64-js@^1.0.2:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.3.1.tgz#58ece8cb75dd07e71ed08c736abc5fac4dbf8df1"
@@ -9642,7 +9647,14 @@ fb-watchman@^2.0.0:
   dependencies:
     bser "2.1.1"
 
-fbjs@^0.8.0:
+fbemitter@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/fbemitter/-/fbemitter-2.1.1.tgz#523e14fdaf5248805bb02f62efc33be703f51865"
+  integrity sha1-Uj4U/a9SSIBbsC9i78M75wP1GGU=
+  dependencies:
+    fbjs "^0.8.4"
+
+fbjs@^0.8.0, fbjs@^0.8.4:
   version "0.8.17"
   resolved "https://registry.yarnpkg.com/fbjs/-/fbjs-0.8.17.tgz#c4d598ead6949112653d6588b01a5cdcd9f90fdd"
   integrity sha1-xNWY6taUkRJlPWWIsBpc3Nn5D90=
@@ -9956,6 +9968,14 @@ flush-write-stream@^2.0.0:
     inherits "^2.0.3"
     readable-stream "^3.1.1"
 
+flux@^3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/flux/-/flux-3.1.3.tgz#d23bed515a79a22d933ab53ab4ada19d05b2f08a"
+  integrity sha1-0jvtUVp5oi2TOrU6tK2hnQWy8Io=
+  dependencies:
+    fbemitter "^2.0.0"
+    fbjs "^0.8.0"
+
 fn.name@1.x.x:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/fn.name/-/fn.name-1.1.0.tgz#26cad8017967aea8731bc42961d04a3d5988accc"
@@ -13541,6 +13561,11 @@ lodash.clonedeep@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
   integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
 
+lodash.curry@^4.0.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/lodash.curry/-/lodash.curry-4.1.1.tgz#248e36072ede906501d75966200a86dab8b23170"
+  integrity sha1-JI42By7ekGUB11lmIAqG2riyMXA=
+
 lodash.debounce@^4.0.8:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/lodash.debounce/-/lodash.debounce-4.0.8.tgz#82d79bff30a67c4005ffd5e2515300ad9ca4d7af"
@@ -13581,6 +13606,11 @@ lodash.flattendeep@^4.4.0:
   resolved "https://registry.yarnpkg.com/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz#fb030917f86a3134e5bc9bec0d69e0013ddfedb2"
   integrity sha1-+wMJF/hqMTTlvJvsDWngAT3f7bI=
 
+lodash.flow@^3.3.0:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.flow/-/lodash.flow-3.5.0.tgz#87bf40292b8cf83e4e8ce1a3ae4209e20071675a"
+  integrity sha1-h79AKSuM+D5OjOGjrkIJ4gBxZ1o=
+
 lodash.foreach@^4.3.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.foreach/-/lodash.foreach-4.5.0.tgz#1a6a35eace401280c7f06dddec35165ab27e3e53"
@@ -17227,7 +17257,7 @@ prop-types-exact@^1.2.0:
     object.assign "^4.1.0"
     reflect.ownkeys "^0.2.0"
 
-prop-types@^15.0.0, prop-types@^15.5.0, prop-types@^15.5.8, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2:
+prop-types@^15.0.0, prop-types@^15.5.0, prop-types@^15.5.8, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2:
   version "15.7.2"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
   integrity sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==
@@ -17355,6 +17385,11 @@ pupa@^2.0.1:
   dependencies:
     escape-goat "^2.0.0"
 
+pure-color@^1.2.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/pure-color/-/pure-color-1.3.0.tgz#1fe064fb0ac851f0de61320a8bf796836422f33e"
+  integrity sha1-H+Bk+wrIUfDeYTIKi/eWg2Qi8z4=
+
 q@^1.1.2, q@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"
@@ -17524,6 +17559,16 @@ react-attr-converter@^0.3.1:
   resolved "https://registry.yarnpkg.com/react-attr-converter/-/react-attr-converter-0.3.1.tgz#4a2abf6d907b7ddae4d862dfec80e489ce41ad6e"
   integrity sha512-dSxo2Mn6Zx4HajeCeQNLefwEO4kNtV/0E682R1+ZTyFRPqxDa5zYb5qM/ocqw9Bxr/kFQO0IUiqdV7wdHw+Cdg==
 
+react-base16-styling@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/react-base16-styling/-/react-base16-styling-0.6.0.tgz#ef2156d66cf4139695c8a167886cb69ea660792c"
+  integrity sha1-7yFW1mz0E5aVyKFniGy2nqZgeSw=
+  dependencies:
+    base16 "^1.0.0"
+    lodash.curry "^4.0.1"
+    lodash.flow "^3.3.0"
+    pure-color "^1.2.0"
+
 react-dev-utils@^10.2.1:
   version "10.2.1"
   resolved "https://registry.yarnpkg.com/react-dev-utils/-/react-dev-utils-10.2.1.tgz#f6de325ae25fa4d546d09df4bb1befdc6dd19c19"
@@ -17620,6 +17665,16 @@ react-is@^16.12.0, react-is@^16.6.0, react-is@^16.6.3, react-is@^16.7.0, react-i
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
   integrity sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==
 
+react-json-view@^1.19.1:
+  version "1.19.1"
+  resolved "https://registry.yarnpkg.com/react-json-view/-/react-json-view-1.19.1.tgz#95d8e59e024f08a25e5dc8f076ae304eed97cf5c"
+  integrity sha512-u5e0XDLIs9Rj43vWkKvwL8G3JzvXSl6etuS5G42a8klMohZuYFQzSN6ri+/GiBptDqlrXPTdExJVU7x9rrlXhg==
+  dependencies:
+    flux "^3.1.3"
+    react-base16-styling "^0.6.0"
+    react-lifecycles-compat "^3.0.4"
+    react-textarea-autosize "^6.1.0"
+
 react-lifecycles-compat@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/react-lifecycles-compat/-/react-lifecycles-compat-3.0.4.tgz#4f1a273afdfc8f3488a8c516bfda78f872352362"
@@ -17722,6 +17777,13 @@ react-test-renderer@^16.0.0-0:
     react-is "^16.8.6"
     scheduler "^0.19.1"
 
+react-textarea-autosize@^6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/react-textarea-autosize/-/react-textarea-autosize-6.1.0.tgz#df91387f8a8f22020b77e3833c09829d706a09a5"
+  integrity sha512-F6bI1dgib6fSvG8so1HuArPUv+iVEfPliuLWusLF+gAKz0FbB4jLrWUrTAeq1afnPT2c9toEZYUdz/y1uKMy4A==
+  dependencies:
+    prop-types "^15.6.0"
+
 react-toggle@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/react-toggle/-/react-toggle-4.1.1.tgz#2317f67bf918ea3508a96b09dd383efd9da572af"