diff --git a/src/common/optionsPermissions.js b/src/common/optionsPermissions.js
index bb84a88..2fa298b 100644
--- a/src/common/optionsPermissions.js
+++ b/src/common/optionsPermissions.js
@@ -9,9 +9,6 @@
 const requiredPermissions = {
   permissions: new Set([
     'storage', 'alarms',
-    // #!if ['chromium', 'chromium_mv3'].includes(browser_target)
-    'declarativeNetRequestWithHostAccess',
-    // #!endif
     // #!if browser_target == 'chromium_mv3'
     'scripting',
     // #!endif
diff --git a/src/common/optionsPrototype.ts b/src/common/optionsPrototype.ts
index 6ba534a..17e9056 100644
--- a/src/common/optionsPrototype.ts
+++ b/src/common/optionsPrototype.ts
@@ -49,11 +49,6 @@
     context: "options",
     killSwitchType: "option",
   },
-  loaddrafts: {
-    defaultValue: false,
-    context: "options",
-    killSwitchType: "option",
-  },
   increasecontrast: {
     defaultValue: false,
     context: "options",
@@ -131,28 +126,11 @@
     context: "options",
     killSwitchType: "option",
   },
-  // #!if ['chromium', 'chromium_mv3'].includes(browser_target)
-  blockdrafts: {
-    defaultValue: false,
-    context: "options",
-    killSwitchType: "option",
-  },
-  // #!endif
   perforumstats: {
     defaultValue: false,
     context: "options",
     killSwitchType: "option",
   },
-  interopthreadpage: {
-    defaultValue: false,
-    context: "options",
-    killSwitchType: "option",
-  },
-  interopthreadpage_mode: {
-    defaultValue: "previous",
-    context: "options",
-    killSwitchType: "ignore",
-  },
   uispacing: {
     defaultValue: false,
     context: "options",
@@ -235,4 +213,26 @@
     context: "deprecated",
     killSwitchType: "deprecated",
   },
+  loaddrafts: {
+    defaultValue: false,
+    context: "deprecated",
+    killSwitchType: "deprecated",
+  },
+  // #!if ['chromium', 'chromium_mv3'].includes(browser_target)
+  blockdrafts: {
+    defaultValue: false,
+    context: "deprecated",
+    killSwitchType: "deprecated",
+  },
+  // #!endif
+  interopthreadpage: {
+    defaultValue: false,
+    context: "deprecated",
+    killSwitchType: "deprecated",
+  },
+  interopthreadpage_mode: {
+    defaultValue: "previous",
+    context: "deprecated",
+    killSwitchType: "ignore",
+  },
 };
diff --git a/src/common/specialOptions.json5 b/src/common/specialOptions.json5
index 58d330c..37b69fa 100644
--- a/src/common/specialOptions.json5
+++ b/src/common/specialOptions.json5
@@ -2,5 +2,4 @@
   'profileindicatoralt_months',
   'ccdarktheme_mode',
   'ccdarktheme_switch_enabled',
-  'interopthreadpage_mode',
 ]
diff --git a/src/contentScripts/communityConsole/main.js b/src/contentScripts/communityConsole/main.js
index 637e061..309e41b 100644
--- a/src/contentScripts/communityConsole/main.js
+++ b/src/contentScripts/communityConsole/main.js
@@ -58,9 +58,6 @@
   // Canned response tags (for the "import CR" popup for the workflows feature)
   'ec-canned-response-row .tags',
 
-  // Thread page main content
-  'ec-thread > .page > .material-content > div[role="list"]',
-
   // Thread page reply section (for the thread page toolbar)
   kRepliesSectionSelector,
 
@@ -141,12 +138,6 @@
       window.TWPTWorkflowsImport.addButtonIfEnabled(node);
     }
 
-    // Inject old thread page design warning if applicable
-    if (node.matches(
-            'ec-thread > .page > .material-content > div[role="list"]')) {
-      window.TWPTThreadPageDesignWarning.injectWarningIfApplicable(node);
-    }
-
     // Inject thread toolbar
     if (threadToolbar.shouldInject(node)) {
       threadToolbar.injectIfApplicable(node);
@@ -208,8 +199,7 @@
   flattenThreads = new FlattenThreads();
   reportDialogColorThemeFix = new ReportDialogColorThemeFix(options);
 
-  // threadPageDesignWarning and workflowsImport are
-  // initialized in start.js
+  // workflowsImport is initialized in start.js
 
   // Before starting the mutation Observer, check whether we missed any
   // mutations by manually checking whether some watched nodes already
diff --git a/src/contentScripts/communityConsole/start.js b/src/contentScripts/communityConsole/start.js
index 063f58a..cc54540 100644
--- a/src/contentScripts/communityConsole/start.js
+++ b/src/contentScripts/communityConsole/start.js
@@ -2,15 +2,11 @@
 import {getOptions} from '../../common/optionsUtils.js';
 
 import FlattenThreadsReplyActionHandler from './flattenThreads/replyActionHandler.js';
-import ThreadPageDesignWarning from './threadPageDesignWarning.js';
 import WorkflowsImport from './workflows/import.js';
 
-const SMEI_RCE_THREAD_INTEROP = 22;
-
 getOptions(null).then(options => {
   /* IMPORTANT NOTE: Remember to change this when changing the "ifs" below!! */
-  if (options.loaddrafts || options.interopthreadpage ||
-      options.fixpekb269560789) {
+  if (options.fixpekb269560789) {
     var startup =
         JSON.parse(document.querySelector('html').getAttribute('data-startup'));
 
@@ -20,31 +16,12 @@
       }
     }
 
-    if (options.loaddrafts) {
-      startup[4][13] = true;
-    }
-
-    if (options.interopthreadpage) {
-      var index = startup[1][6].indexOf(SMEI_RCE_THREAD_INTEROP);
-
-      switch (options.interopthreadpage_mode) {
-        case 'previous':
-          if (index > -1) startup[1][6].splice(index, 1);
-          break;
-
-        case 'next':
-          if (index == -1) startup[1][6].push(SMEI_RCE_THREAD_INTEROP);
-          break;
-      }
-    }
-
     document.querySelector('html').setAttribute(
         'data-startup', JSON.stringify(startup));
   }
 
   // Initialized here instead of in main.js so the first event is received if it
   // happens when the page loads.
-  window.TWPTThreadPageDesignWarning = new ThreadPageDesignWarning();
   window.TWPTWorkflowsImport = new WorkflowsImport();
 
   if (options.ccdarktheme) {
diff --git a/src/contentScripts/communityConsole/threadPageDesignWarning.js b/src/contentScripts/communityConsole/threadPageDesignWarning.js
deleted file mode 100644
index 155d916..0000000
--- a/src/contentScripts/communityConsole/threadPageDesignWarning.js
+++ /dev/null
@@ -1,162 +0,0 @@
-import {MDCTooltip} from '@material/tooltip';
-import {waitFor} from 'poll-until-promise';
-
-import {parseUrl} from '../../common/commonUtils.js';
-import {injectStylesheet} from '../../common/contentScriptsUtils.js';
-import {getDocURL} from '../../common/extUtils.js';
-import {getOptions} from '../../common/optionsUtils.js';
-
-import {createExtBadge} from './utils/common.js';
-
-const kSMEINestedReplies = 15;
-const kViewThreadResponse = 'TWPT_ViewThreadResponse';
-
-export default class ThreadPageDesignWarning {
-  constructor() {
-    this.lastThread = {
-      body: {},
-      id: -1,
-      timestamp: 0,
-    };
-    this.setUpHandler();
-
-    // We have to save whether the old UI was enabled at startup, since that's
-    // the moment when it takes effect. If the option changes while the tab is
-    // open, it won't take effect.
-    getOptions([
-      'interopthreadpage', 'interopthreadpage_mode'
-    ]).then(options => {
-      this.shouldShowWarning = options.interopthreadpage &&
-          options.interopthreadpage_mode == 'previous';
-
-      if (this.shouldShowWarning) {
-        injectStylesheet(
-            chrome.runtime.getURL('css/thread_page_design_warning.css'));
-      } else {
-        this.removeHandler();
-      }
-    });
-
-    this.isExperimentEnabled = this.isNestedRepliesExperimentEnabled();
-  }
-
-  isNestedRepliesExperimentEnabled() {
-    if (!document.documentElement.hasAttribute('data-startup')) return false;
-
-    let startup =
-        JSON.parse(document.documentElement.getAttribute('data-startup'));
-    return startup?.[1]?.[6]?.includes?.(kSMEINestedReplies);
-  }
-
-  eventHandler(e) {
-    if (e.detail.id < this.lastThread.id) return;
-
-    this.lastThread = {
-      body: e.detail.body,
-      id: e.detail.id,
-      timestamp: Date.now(),
-    };
-  }
-
-  setUpHandler() {
-    window.addEventListener(kViewThreadResponse, this.eventHandler.bind(this));
-  }
-
-  removeHandler() {
-    window.removeEventListener(
-        kViewThreadResponse, this.eventHandler.bind(this));
-  }
-
-  injectWarning(content) {
-    let div = document.createElement('div');
-    div.classList.add('TWPT-warning');
-
-    let icon = document.createElement('material-icon');
-    icon.classList.add('TWPT-warning--icon');
-
-    let iconContent = document.createElement('i');
-    iconContent.classList.add('material-icon-i', 'material-icons-extended');
-    iconContent.setAttribute('role', 'img');
-    iconContent.setAttribute('aria-hidden', 'true');
-    iconContent.textContent = 'warning';
-
-    icon.append(iconContent);
-
-    let text = document.createElement('div');
-    text.classList.add('TWPT-warning--text');
-    text.textContent =
-        chrome.i18n.getMessage('inject_threadpagedesign_warning');
-
-    let btn = document.createElement('a');
-    btn.classList.add('TWPT-warning--btn');
-    btn.href =
-        getDocURL('features.md#Thread-page-design-in-the-Community-Console');
-    btn.setAttribute('target', '_blank');
-    btn.setAttribute('rel', 'noopener noreferrer');
-
-    const [badge, badgeTooltip] = createExtBadge();
-
-    let btnText = document.createElement('div');
-    btnText.textContent = chrome.i18n.getMessage('btn_learnmore');
-
-    btn.append(badge, btnText);
-
-    div.append(icon, text, btn);
-    content.prepend(div);
-
-    new MDCTooltip(badgeTooltip);
-  }
-
-  injectWarningIfApplicable(content) {
-    return waitFor(
-               () => {
-                 if (this.shouldShowWarning === undefined)
-                   return Promise.reject(
-                       new Error('shouldShowWarning is not defined.'));
-
-                 return Promise.resolve({result: this.shouldShowWarning});
-               },
-               {
-                 interval: 500,
-                 timeout: 10 * 1000,
-               })
-        .then(preShouldShowWarning => {
-          if (!preShouldShowWarning.result) return;
-
-          // If the global SMEI experiment is enabled, all threads use nested
-          // replies, so we'll skip the per-thread check and always show the
-          // warning banner.
-          if (this.isExperimentEnabled) return Promise.resolve({result: true});
-
-          let currentThread = parseUrl(location.href);
-          if (currentThread === false)
-            throw new Error('current thread id cannot be parsed.');
-
-          return waitFor(() => {
-            let now = Date.now();
-            let lastThreadInfo = this.lastThread.body['1']?.['2']?.['1'];
-            if (now - this.lastThread.timestamp > 30 * 1000 ||
-                lastThreadInfo?.['1'] != currentThread.thread ||
-                lastThreadInfo?.['3'] != currentThread.forum)
-              throw new Error(
-                  'cannot obtain information about current thread.');
-
-            // If the messageOrGap field contains any items, the thread is using
-            // nested replies. Otherwise, it probably isn't using them.
-            return Promise.resolve(
-                {result: this.lastThread.body['1']?.['40']?.length > 0});
-          }, {
-            interval: 500,
-            timeout: 10 * 1000,
-          });
-        })
-        .then(shouldShowWarning => {
-          if (shouldShowWarning.result) this.injectWarning(content);
-        })
-        .catch(err => {
-          console.error(
-              '[threadPageDesignWarning] An error ocurred while trying to decide whether to show warning: ',
-              err);
-        });
-  }
-}
diff --git a/src/options/bgHandler.js b/src/options/bgHandler.js
index a9d80ab..52f0d10 100644
--- a/src/options/bgHandler.js
+++ b/src/options/bgHandler.js
@@ -3,42 +3,23 @@
 // content scripts or injected scripts but instead in the background
 // script/service worker.
 //
-// An example is the "blockdrafts" feature, which when enabled should enable the
+// An example was the "blockdrafts" feature, which when enabled enabled the
 // static ruleset blocking *DraftMessages requests.
+//
+// The "blockdrafts" feature was removed, but this logic has been kept in case
+// it is needed in the future.
 
 import {isOptionEnabled} from '../common/optionsUtils.js';
 
 // List of features controled in the background:
-export var bgFeatures = [
-  'blockdrafts',
-];
-
-const blockDraftsRuleset = 'blockDrafts';
+export var bgFeatures = [];
 
 export function handleBgOptionChange(feature) {
   isOptionEnabled(feature)
+      // eslint-disable-next-line no-unused-vars
       .then(enabled => {
-        switch (feature) {
-          // #!if ['chromium', 'chromium_mv3'].includes(browser_target)
-          case 'blockdrafts':
-            chrome.declarativeNetRequest.getEnabledRulesets(rulesets => {
-              if (rulesets === undefined) {
-                throw new Error(
-                    chrome.runtime.lastError.message ??
-                    'Unknown error in chrome.declarativeNetRequest.getEnabledRulesets()');
-              }
-
-              let isRulesetEnabled = rulesets.includes(blockDraftsRuleset);
-              if (!isRulesetEnabled && enabled)
-                chrome.declarativeNetRequest.updateEnabledRulesets(
-                    {enableRulesetIds: [blockDraftsRuleset]});
-              if (isRulesetEnabled && !enabled)
-                chrome.declarativeNetRequest.updateEnabledRulesets(
-                    {disableRulesetIds: [blockDraftsRuleset]});
-            });
-            break;
-            // #!endif
-        }
+        // eslint-disable-next-line no-empty
+        switch (feature) {}
       })
       .catch(err => {
         console.error(
diff --git a/src/options/optionsCommon.js b/src/options/optionsCommon.js
index 557f6aa..f8d5c14 100644
--- a/src/options/optionsCommon.js
+++ b/src/options/optionsCommon.js
@@ -19,9 +19,6 @@
       case 'ccdarktheme_mode':
         return document.getElementById(opt).value || 'switch';
 
-      case 'interopthreadpage_mode':
-        return document.getElementById(opt).value || 'previous';
-
       default:
         console.warn('Unrecognized option: ' + opt);
         return undefined;
@@ -226,25 +223,6 @@
                 .appendChild(select);
             break;
 
-          case 'interopthreadpage_mode':
-            var select = document.createElement('select');
-            select.id = 'interopthreadpage_mode';
-
-            const threadPageModes = ['previous', 'next'];
-            for (const mode of threadPageModes) {
-              let modeOption = document.createElement('option');
-              modeOption.value = mode;
-              modeOption.textContent = chrome.i18n.getMessage(
-                  'options_interopthreadpage_mode_' + mode);
-              if (items.interopthreadpage_mode == mode)
-                modeOption.selected = true;
-              select.appendChild(modeOption);
-            }
-
-            document.getElementById('interopthreadpage_mode--container')
-                .appendChild(select);
-            break;
-
           default:
             console.warn('Unrecognized option: ' + opt);
             break;
diff --git a/src/options/optionsPage.json5 b/src/options/optionsPage.json5
index 92a554f..f3ea342 100644
--- a/src/options/optionsPage.json5
+++ b/src/options/optionsPage.json5
@@ -17,9 +17,6 @@
         {codename: 'perforumstats'},
         {codename: 'batchlock'},
         {codename: 'autorefreshlist'},
-        // #!if ['chromium', 'chromium_mv3'].includes(browser_target)
-        {codename: 'blockdrafts'},
-        // #!endif
       ],
     },
     {
@@ -35,7 +32,6 @@
       options: [
         {codename: 'fixedtoolbar'},
         {codename: 'redirect'},
-        {codename: 'loaddrafts', experimental: true},
         {codename: 'increasecontrast'},
         {codename: 'stickysidebarheaders'},
         {codename: 'ccforcehidedrawer'},
@@ -45,7 +41,6 @@
         {codename: 'enhancedannouncementsdot'},
         {codename: 'repositionexpandthread', experimental: true},
         {codename: 'imagemaxheight'},
-        {codename: 'interopthreadpage'},
         {codename: 'uispacing'},
       ],
     },
diff --git a/src/static/_locales/en/messages.json b/src/static/_locales/en/messages.json
index 4c655f7..27c732c 100644
--- a/src/static/_locales/en/messages.json
+++ b/src/static/_locales/en/messages.json
@@ -63,10 +63,6 @@
     "message": "Redirect all threads opened in TW to the Community Console.",
     "description": "Feature checkbox in the options page"
   },
-  "options_loaddrafts": {
-    "message": "Activate the <code class=\"help\" title=\"This flag allows the Community Console to load a previously autosaved reply when loading a thread and clicking the reply button.\">enableLoadingDraftMessages<\/code> Community Console flag.",
-    "description": "Feature checkbox in the options page"
-  },
   "options_experimental_label": {
     "message": "(experimental)",
     "description": "Label which is placed next to an option to indicate that it may not work well or may break at any time"
@@ -139,10 +135,6 @@
     "message": "Show the number of questions and replies written by the OP within the last <span id='profileindicatoralt_months--container'></span> months next to their username.",
     "description": "Feature checkbox in the options page"
   },
-  "options_blockdrafts": {
-    "message": "Block the sending of your replies as you type to Google servers in the Community Console.",
-    "description": "Feature checkbox in the options page"
-  },
   "options_workflows": {
     "message": "Enable the workflows feature.",
     "description": "Feature checkbox in the options page"
@@ -159,18 +151,6 @@
     "message": "Show per-forum activity in profiles.",
     "description": "Feature checkbox in the options page"
   },
-  "options_interopthreadpage": {
-    "message": "Show <span id='interopthreadpage_mode--container'></span> in the Community Console.",
-    "description": "Feature checkbox in the options page. \"<span id='interopthreadpage_mode--container'></span>\" will be substituted with a selector which allows users to select whether they want the new thread page design or the old one."
-  },
-  "options_interopthreadpage_mode_previous": {
-    "message": "the old thread page design",
-    "description": "Select option added in #interopthreadpage_mode--container, in the options_interopthreadpage string"
-  },
-  "options_interopthreadpage_mode_next": {
-    "message": "the new thread page design",
-    "description": "Select option added in #interopthreadpage_mode--container, in the options_interopthreadpage string"
-  },
   "options_uispacing": {
     "message": "Reduce the whitespace in the Community Console and TW.",
     "description": "Feature checkbox in the options page"
diff --git a/templates/manifest.gjson b/templates/manifest.gjson
index 2f3f4cf..80c86a9 100644
--- a/templates/manifest.gjson
+++ b/templates/manifest.gjson
@@ -76,9 +76,6 @@
 #if defined(CHROMIUM || GECKO)
     "https://support.google.com/*",
 #endif
-#if defined(CHROMIUM || CHROMIUM_MV3)
-    "declarativeNetRequestWithHostAccess",
-#endif
 #if defined(CHROMIUM_MV3)
     "scripting",
 #endif
@@ -141,15 +138,6 @@
     }
 #endif
   ],
-#if defined(CHROMIUM || CHROMIUM_MV3)
-  "declarative_net_request": {
-    "rule_resources": [{
-      "id": "blockDrafts",
-      "enabled": false,
-      "path": "rulesets/blockDrafts.json"
-    }]
-  },
-#endif
 #if defined(CHROMIUM || GECKO)
   "browser_action": {},
 #endif