diff --git a/api_webchat/controller.js b/api_webchat/controller.js
index bcdb851b..cb315ea8 100644
--- a/api_webchat/controller.js
+++ b/api_webchat/controller.js
@@ -66,13 +66,13 @@ messageInput.setMessagesArea(messagesArea);
 
 switch (llm) {
     case "chatgpt_api": {
-        let prefs_api = await browser.storage.sync.get({chatgpt_api_key: '', chatgpt_model: '', do_debug: false});
+        let prefs_api = await browser.storage.sync.get({chatgpt_api_key: '', chatgpt_model: '', chatgpt_developer_messages:'', do_debug: false});
         let i18nStrings = {};
         i18nStrings["chatgpt_api_request_failed"] = browser.i18n.getMessage('chatgpt_api_request_failed');
         i18nStrings["error_connection_interrupted"] = browser.i18n.getMessage('error_connection_interrupted');
         messageInput.setModel(prefs_api.chatgpt_model);
         messagesArea.setLLMName("ChatGPT");
-        worker.postMessage({ type: 'init', chatgpt_api_key: prefs_api.chatgpt_api_key, chatgpt_model: prefs_api.chatgpt_model, do_debug: prefs_api.do_debug, i18nStrings: i18nStrings});
+        worker.postMessage({ type: 'init', chatgpt_api_key: prefs_api.chatgpt_api_key, chatgpt_model: prefs_api.chatgpt_model, chatgpt_developer_messages: prefs_api.chatgpt_developer_messages, do_debug: prefs_api.do_debug, i18nStrings: i18nStrings});
         messagesArea.appendUserMessage(browser.i18n.getMessage("chagpt_api_connecting") + " " +browser.i18n.getMessage("AndModel") + " \"" + prefs_api.chatgpt_model + "\"...", "info");
         browser.runtime.sendMessage({command: "openai_api_ready_" + call_id, window_id: (await browser.windows.getCurrent()).id});
         break;
diff --git a/js/api/openai.js b/js/api/openai.js
index 11d4398d..2bcf86a8 100644
--- a/js/api/openai.js
+++ b/js/api/openai.js
@@ -23,11 +23,13 @@ export class OpenAI {
 
   apiKey = '';
   model = '';
+  developer_messages = '';
   stream = false;
 
-  constructor(apiKey, model, stream) {
+  constructor(apiKey, model, developer_messages, stream) {
     this.apiKey = apiKey;
     this.model = model;
+    this.developer_messages = developer_messages;
     this.stream = stream;
   }
 
@@ -69,6 +71,13 @@ export class OpenAI {
   }
 
   fetchResponse = async (messages, maxTokens = 0) => {
+
+    if(this.developer_messages !== ''){
+       messages.push({role: "developer", content: [{"type": "text", "text": this.developer_messages}]});
+    }
+
+    // console.log(">>>>>>>>>>> OpenAI API request: " + JSON.stringify(messages));
+
     try {
       const response = await fetch("https://api.openai.com/v1/chat/completions", {
           method: "POST",
diff --git a/js/special_commands/mzta-add-tags.js b/js/special_commands/mzta-add-tags.js
index 6280ef84..3902b00e 100644
--- a/js/special_commands/mzta-add-tags.js
+++ b/js/special_commands/mzta-add-tags.js
@@ -53,8 +53,8 @@
     async initWorker() {
         switch (this.llm) {
             case "chatgpt_api": {
-                let prefs_api = await browser.storage.sync.get({chatgpt_api_key: '', chatgpt_model: ''});
-                this.worker.postMessage({ type: 'init', chatgpt_api_key: prefs_api.chatgpt_api_key, chatgpt_model: prefs_api.chatgpt_model, do_debug: this.do_debug, i18nStrings: ''});
+                let prefs_api = await browser.storage.sync.get({chatgpt_api_key: '', chatgpt_model: '', chatgpt_developer_messages: ''});
+                this.worker.postMessage({ type: 'init', chatgpt_api_key: prefs_api.chatgpt_api_key, chatgpt_model: prefs_api.chatgpt_model, chatgpt_developer_messages: prefs_api.chatgpt_developer_messages, do_debug: this.do_debug, i18nStrings: ''});
                 break;
             }
             case "google_gemini_api": {
diff --git a/js/workers/model-worker-openai.js b/js/workers/model-worker-openai.js
index 3f364682..536dc96d 100644
--- a/js/workers/model-worker-openai.js
+++ b/js/workers/model-worker-openai.js
@@ -38,7 +38,7 @@ self.onmessage = async function(event) {
     if (event.data.type === 'init') {
         chatgpt_api_key = event.data.chatgpt_api_key;
         chatgpt_model = event.data.chatgpt_model;
-        openai = new OpenAI(chatgpt_api_key, chatgpt_model, true);
+        openai = new OpenAI(chatgpt_api_key, chatgpt_model, event.data.chatgpt_developer_messages, true);
         do_debug = event.data.do_debug;
         i18nStrings = event.data.i18nStrings;
         taLog = new taLogger('model-worker-openai', do_debug);