diff --git a/.github/workflows/test-trigger.yml b/.github/workflows/test-trigger.yml
index fabd95657..f31f215a1 100644
--- a/.github/workflows/test-trigger.yml
+++ b/.github/workflows/test-trigger.yml
@@ -6,11 +6,10 @@ name: Trigger E2E tests
 
 on:
   push:
-    branches: [ staging, 2025.9-rc, 2025.9-test ]
+    branches: [ staging, 2025.12-rc, 2025.12-test ]
 
 jobs:
   trigger-tests:
-    if: github.ref_name == 'staging'
     runs-on: ubuntu-latest
     steps:
       - name: Trigger E2E test run (local)
@@ -19,9 +18,9 @@ jobs:
 
           if [ "$branch" = "staging" ]; then
             event_type="trigger-e2e-tests-staging"
-          elif [ "$branch" = "2025.9-rc" ]; then
+          elif [ "$branch" = "2025.12-rc" ]; then
             event_type="trigger-e2e-tests-rc"
-          elif [ "$branch" = "2025.9-test" ]; then
+          elif [ "$branch" = "2025.12-test" ]; then
             event_type="trigger-e2e-tests-test"
           fi 
 
diff --git a/lib/api.js b/lib/api.js
index eec25ea35..bf5c71e51 100644
--- a/lib/api.js
+++ b/lib/api.js
@@ -173,16 +173,16 @@ nThen(function (w) {
                 let oldUsers = Env.maxConcurrentRegUsers || 0;
                 let stats = Server.getSessionStats();
                 let chans = Server.getActiveChannelCount();
-                let reg = 0;
-                let regKeys = [];
-                Object.keys(Env.netfluxUsers).forEach(id => {
-                    let keys = Env.netfluxUsers[id];
-                    let key = Object.keys(keys || {})[0];
-                    if (!key) { return; }
-                    if (regKeys.includes(key)) { return; }
-                    reg++;
-                    regKeys.push(key);
-                });
+
+                const map = Env.netfluxUsers;
+                // Extract public key from each ws connection
+                let regKeys = Object.keys(map).map(id => {
+                    return Object.keys(map[id] || {})[0];
+                }).filter(Boolean);
+                // Convert to set to get only unique values
+                let regSet = new Set(regKeys);
+                const reg = regSet.size;
+
                 Env.maxConcurrentWs = Math.max(oldWs, stats.total);
                 Env.maxConcurrentUniqueWs = Math.max(oldUniqueWs, stats.unique);
                 Env.maxConcurrentRegUsers = Math.max(oldUsers, reg);
@@ -194,9 +194,10 @@ nThen(function (w) {
             try {
                 let users = Env.netfluxUsers || {};
                 let online = Server.getOnlineUsers() || [];
+                let onlineSet = new Set(online);
                 let removed = 0;
                 Object.keys(users).forEach(id => {
-                    if (!online.includes(id)) {
+                    if (!onlineSet.has(id)) {
                         delete users[id];
                         removed++;
                     }
@@ -209,9 +210,10 @@ nThen(function (w) {
                 let HK = require('./hk-utils');
                 let chans = Env.channel_cache || {};
                 let active = Server.getActiveChannels() || [];
+                let activeSet = new Set(active);
                 let removed = 0;
                 Object.keys(chans).forEach(id => {
-                    if (!active.includes(id)) {
+                    if (!activeSet.has(id)) {
                         HK.dropChannel(Env, id);
                         removed++;
                     }
diff --git a/lib/storage/file.js b/lib/storage/file.js
index b6b42a1c1..76563d1e2 100644
--- a/lib/storage/file.js
+++ b/lib/storage/file.js
@@ -286,9 +286,9 @@ var closeChannel = function (env, channelName, cb) {
     }
 };
 
-var closeInactiveChannels = function (env, schedule, active) {
+var closeInactiveChannels = function (env, schedule, activeSet) {
     Object.keys(env.channels).forEach(channelName => {
-        if (!active.includes(channelName)) {
+        if (!activeSet.has(channelName)) {
             schedule.ordered(channelName, function (next) {
                 closeChannel(env, channelName, next);
             });
@@ -1473,8 +1473,8 @@ module.exports.create = function (conf, _cb) {
                     closeChannel(env, channelName, Util.both(cb, next));
                 });
             },
-            closeInactiveChannels: function (active) {
-                closeInactiveChannels(env, schedule, active);
+            closeInactiveChannels: function (activeSet) {
+                closeInactiveChannels(env, schedule, activeSet);
             },
             // write to a log file
             log: function (channelName, content, cb) {
diff --git a/src/common/common-util.js b/src/common/common-util.js
index c48bf809f..e3635e165 100644
--- a/src/common/common-util.js
+++ b/src/common/common-util.js
@@ -314,13 +314,7 @@ const factory = (NaclUtil) => {
     };
 
     Util.deduplicateString = function (array) {
-        var a = array.slice();
-        for(var i=0; i<a.length; i++) {
-            for(var j=i+1; j<a.length; j++) {
-                if(a[i] === a[j]) { a.splice(j--, 1); }
-            }
-        }
-        return a;
+        return Array.from(new Set(array));
     };
 
     /*
diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index ae715f7e8..bc4b113f1 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -918,6 +918,7 @@ define([
                             ooChannel.send(obj.data.msg);
                             ooChannel.lastHash = obj.data.hash;
                             ooChannel.cpIndex++;
+                            common.notify();
                         } else {
                             ooChannel.queue.push(obj.data);
                         }
@@ -3170,13 +3171,11 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                 var setHistoryMode = function (bool) {
                     if (bool) {
                         APP.history = true;
+                        toolbar.setHistory(true);
                         try { getEditor().asc_setRestriction(true); } catch (e) {}
-                        $('.cp-toolbar-title-readonly').css('display', 'inline-flex');
-                        $('.cp-toolbar-title-edit').hide();
                         return;
                     }
-                    $('.cp-toolbar-title-readonly').hide();
-                    $('.cp-toolbar-title-edit').show();
+                    toolbar.setHistory(false);
                     // Cancel button: redraw from lastCp
                     APP.history = false;
                     ooChannel.queue = [];
diff --git a/www/common/onlyoffice/main.js b/www/common/onlyoffice/main.js
index c3751aa0d..cc1a0e62c 100644
--- a/www/common/onlyoffice/main.js
+++ b/www/common/onlyoffice/main.js
@@ -123,8 +123,8 @@ define([
                             toPin.push(id);
                         }
                     });
-                    toPin = Utils.Util.deduplicateString(toPin);
-                    toUnpin = Utils.Util.deduplicateString(toUnpin);
+                    if (toPin.length) { Cryptpad.pinPads(toPin, function () {}); }
+                    if (toUnpin.length) { Cryptpad.unpinPads(toUnpin, function () {}); }
                     Cryptpad.pinPads(toPin, function () {});
                     Cryptpad.unpinPads(toUnpin, function () {});
                     if (!toPin.length && !toUnpin.length) { return; }