diff --git a/src/common/optionsPrototype.json5 b/src/common/optionsPrototype.json5
index 5866b0e..6b6e01b 100644
--- a/src/common/optionsPrototype.json5
+++ b/src/common/optionsPrototype.json5
@@ -124,6 +124,16 @@
     context: 'options',
     killSwitchType: 'option',
   },
+  'interopthreadpage': {
+    defaultValue: false,
+    context: 'options',
+    killSwitchType: 'option',
+  },
+  'interopthreadpage_mode': {
+    defaultValue: 'previous',
+    context: 'options',
+    killSwitchType: 'ignore',
+  },
 
   // Experiments:
   'workflows': {
@@ -136,6 +146,11 @@
     context: 'experiments',
     killSwitchType: 'experiment',
   },
+  'nestedreplies': {
+    defaultValue: false,
+    context: 'experiments',
+    killSwitchType: 'experiment',
+  },
 
   // Internal options:
   'ccdarktheme_switch_enabled': {
diff --git a/src/common/specialOptions.json5 b/src/common/specialOptions.json5
index 37b69fa..58d330c 100644
--- a/src/common/specialOptions.json5
+++ b/src/common/specialOptions.json5
@@ -2,4 +2,5 @@
   'profileindicatoralt_months',
   'ccdarktheme_mode',
   'ccdarktheme_switch_enabled',
+  'interopthreadpage_mode',
 ]
diff --git a/src/contentScripts/communityConsole/start.js b/src/contentScripts/communityConsole/start.js
index 250df78..d30a113 100644
--- a/src/contentScripts/communityConsole/start.js
+++ b/src/contentScripts/communityConsole/start.js
@@ -4,9 +4,12 @@
 import AutoRefresh from './autoRefresh.js';
 import ExtraInfo from './extraInfo.js';
 
+const SMEI_NESTED_REPLIES = 15;
+const SMEI_RCE_THREAD_INTEROP = 22;
+
 getOptions(null).then(options => {
   /* IMPORTANT NOTE: Remember to change this when changing the "ifs" below!! */
-  if (options.loaddrafts) {
+  if (options.loaddrafts || options.interopthreadpage) {
     var startup =
         JSON.parse(document.querySelector('html').getAttribute('data-startup'));
 
@@ -14,6 +17,25 @@
       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;
+      }
+    }
+
+    if (options.nestedreplies) {
+      if (!startup[1][6].includes(SMEI_NESTED_REPLIES))
+        startup[1][6].push(SMEI_NESTED_REPLIES);
+    }
+
     document.querySelector('html').setAttribute(
         'data-startup', JSON.stringify(startup));
   }
diff --git a/src/options/optionsCommon.js b/src/options/optionsCommon.js
index abfc306..99874e5 100644
--- a/src/options/optionsCommon.js
+++ b/src/options/optionsCommon.js
@@ -35,6 +35,9 @@
       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;
@@ -239,6 +242,24 @@
                 .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 0de4df5..a5c9ff5 100644
--- a/src/options/optionsPage.json5
+++ b/src/options/optionsPage.json5
@@ -43,6 +43,7 @@
         {codename: 'enhancedannouncementsdot'},
         {codename: 'repositionexpandthread', experimental: true},
         {codename: 'imagemaxheight'},
+        {codename: 'interopthreadpage'},
       ],
     },
   ],
diff --git a/src/static/_locales/en/messages.json b/src/static/_locales/en/messages.json
index f6ac4be..23e03f6 100644
--- a/src/static/_locales/en/messages.json
+++ b/src/static/_locales/en/messages.json
@@ -159,6 +159,22 @@
     "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_nestedreplies": {
+    "message": "Turn on the nested replies feature in the Community Console.",
+    "description": "Feature checkbox in the options page"
+  },
   "options_save": {
     "message": "Save",
     "description": "Button in the options page to save the settings"
diff --git a/src/static/options/experiments.html b/src/static/options/experiments.html
index 9a21fdf..615d5ec 100644
--- a/src/static/options/experiments.html
+++ b/src/static/options/experiments.html
@@ -15,6 +15,7 @@
         <div id="optional-permissions-warning" hidden data-i18n="optionalpermissionswarning_header"></div>
         <div class="option"><input type="checkbox" id="workflows"> <label for="workflows" data-i18n="workflows"></label> <button id="manage-workflows" data-i18n="workflows_manage"></button></div>
         <div class="option"><input type="checkbox" id="extrainfo"> <label for="extrainfo" data-i18n="extrainfo"></label></div>
+        <div class="option"><input type="checkbox" id="nestedreplies"> <label for="nestedreplies" data-i18n="nestedreplies"></label></div>
         <div class="actions"><button id="save" data-i18n="save"></button></div>
       </form>
       <div id="save-indicator"></div>