diff --git a/js/mzta-utils.js b/js/mzta-utils.js
index dca1a52a..9b932ac0 100644
--- a/js/mzta-utils.js
+++ b/js/mzta-utils.js
@@ -349,17 +349,6 @@ export function i18nConditionalGet(str) {
   return str; // Return the original string if the conditions are not met
 }
 
-export async function isThunderbird128OrGreater(){
-  try {
-    const info = await browser.runtime.getBrowserInfo();
-    const version = info.version;
-    return compareThunderbirdVersions(version, '128.0') >= 0;
-  } catch (error) {
-    console.error('[ThunderAI] Error retrieving browser information:', error);
-    return false;
-  }
-}
-
 function compareThunderbirdVersions(v1, v2) {
   const v1parts = v1.split('.').map(Number);
   const v2parts = v2.split('.').map(Number);
@@ -385,12 +374,9 @@ export function generateCallID(length = 10) {
 
 export async function getTagsList(){
   let messageTags = [];
-  if(await isThunderbird128OrGreater()) {
-    // without the tags related permissions, we can't get the tags list
-      messageTags = await browser.messages.tags.list();
-  } else {
-      messageTags = await browser.messages.listTags();
-  }
+  // without the tags related permissions, we can't get the tags list
+  messageTags = await browser.messages.tags.list();
+
   const output = messageTags.map(tag => tag.tag).join(', ');
 
   const output2 = messageTags.reduce((acc, messageTag) => {
@@ -411,11 +397,7 @@ export async function createTag(tag) {
   if(prefs_tag.add_tags_first_uppercase) tag = tag.toLowerCase().charAt(0).toUpperCase() + tag.toLowerCase().slice(1);
   try {
     const tagKey = '$ta-' + generateCallID(16) + '-' + sanitizeString(tag); // Ensure uniqueness with a longer random ID
-    if(await isThunderbird128OrGreater()) {
-      return browser.messages.tags.create(tagKey, tag, generateHexColorForTag());
-    }else{
-      return browser.messages.createTag(tagKey, tag, generateHexColorForTag());
-    }
+    return browser.messages.tags.create(tagKey, tag, generateHexColorForTag());
   } catch (error) {
     console.error('[ThunderAI] Error creating tag:', error);
   }
diff --git a/options/mzta-options.js b/options/mzta-options.js
index 5e73c23d..10d09874 100644
--- a/options/mzta-options.js
+++ b/options/mzta-options.js
@@ -21,7 +21,6 @@ import { taLogger } from '../js/mzta-logger.js';
 import {
   ChatGPTWeb_models,
   checkSparksPresence,
-  isThunderbird128OrGreater,
   openTab,
   getChatGPTWebModelsList_HTML,
   isAPIKeyValue,
@@ -35,7 +34,6 @@ import {
 } from '../pages/_lib/connection-ui.js';
 
 let taLog = new taLogger("mzta-options",true);
-let _isThunderbird128OrGreater = true;
 
 function saveOptions(e) {
   e.preventDefault();
@@ -228,8 +226,6 @@ document.addEventListener('DOMContentLoaded', async () => {
 
   varConnectionUI.permission_all_urls = await messenger.permissions.contains({ origins: ["<all_urls>"] })
 
-  _isThunderbird128OrGreater = await isThunderbird128OrGreater();
-
   // show Owl warning
   const accountList = await messenger.accounts.list(false);
   if(accountList.some(account => account.type.toLowerCase().includes('owl'))) {
@@ -248,11 +244,7 @@ document.addEventListener('DOMContentLoaded', async () => {
     async function _addtags_el_change() {
       if (event.target.checked) {
         let granted = false;
-        if(_isThunderbird128OrGreater){
-          granted = await messenger.permissions.request({ permissions: ["messagesTags", "messagesUpdate"] });
-        }else{
-          granted = await messenger.permissions.request({ permissions: ["messagesTags"] });
-        }
+        granted = await messenger.permissions.request({ permissions: ["messagesTags", "messagesUpdate"] });
         if (!granted) {
           event.target.checked = false;
           addtags_info_btn.disabled = 'disabled';
diff --git a/pages/customdataplaceholders/mzta-custom-dataplaceholders.js b/pages/customdataplaceholders/mzta-custom-dataplaceholders.js
index 2c2e896a..a6b5a5f4 100644
--- a/pages/customdataplaceholders/mzta-custom-dataplaceholders.js
+++ b/pages/customdataplaceholders/mzta-custom-dataplaceholders.js
@@ -17,9 +17,20 @@
  */
 
 import { prefs_default } from "../../options/mzta-options-default.js";
-import { getLocalStorageUsedSpace, sanitizeHtml, isThunderbird128OrGreater, openTab } from "../../js/mzta-utils.js";
+import {
+    getLocalStorageUsedSpace,
+    sanitizeHtml,
+    openTab
+} from "../../js/mzta-utils.js";
 import { taLogger } from "../../js/mzta-logger.js";
-import { getPlaceholders, setCustomPlaceholders, getCustomPlaceholders, prepareCustomDataPHsForExport, prepareCustomDataPHsForImport, placeholdersUtils } from "../../js/mzta-placeholders.js";
+import {
+    getPlaceholders,
+    setCustomPlaceholders,
+    getCustomPlaceholders,
+    prepareCustomDataPHsForExport,
+    prepareCustomDataPHsForImport,
+    placeholdersUtils
+} from "../../js/mzta-placeholders.js";
 import { textareaAutocomplete } from "../../js/mzta-placeholders-autocomplete.js";
 
 let prefs = null;
@@ -550,12 +561,8 @@ async function setStorageSpace() {
     document.getElementById('storage_space').textContent = storage_space;
 }
 
-
-if(await isThunderbird128OrGreater()){
-    window.addEventListener('beforeunload', function (event) {
-        // Check if any changes have been made (Only for Thunderbird 128+ see https://github.com/micz/ThunderAI/issues/88)
-        if (somethingChanged) {
-            event.preventDefault();
-        }
-    });    
-}
\ No newline at end of file
+window.addEventListener('beforeunload', function (event) {
+    if (somethingChanged) {
+        event.preventDefault();
+    }
+});    
diff --git a/pages/customprompts/mzta-custom-prompts.js b/pages/customprompts/mzta-custom-prompts.js
index 9ce27807..70386374 100644
--- a/pages/customprompts/mzta-custom-prompts.js
+++ b/pages/customprompts/mzta-custom-prompts.js
@@ -34,7 +34,6 @@ import {
 } from "../../pages/_lib/connection-ui.js";
 import {
     ChatGPTWeb_models,
-    isThunderbird128OrGreater,
     getLocalStorageUsedSpace,
     sanitizeHtml,
     validateCustomData_ChatGPTWeb,
@@ -1214,14 +1213,11 @@ async function setStorageSpace() {
 }
 
 
-if(await isThunderbird128OrGreater()){
-    window.addEventListener('beforeunload', function (event) {
-        // Check if any changes have been made (Only for Thunderbird 128+ see https://github.com/micz/ThunderAI/issues/88)
-        if (somethingChanged) {
-            event.preventDefault();
-        }
-    });    
-}
+window.addEventListener('beforeunload', function (event) {
+    if (somethingChanged) {
+        event.preventDefault();
+    }
+});
 
 async function checkPromptsConfigForPlaceholders(textarea){
     let curr_text = textarea.value;