diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index defbf4da..b05a47cf 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -1386,5 +1386,29 @@
   "AccountSelector_Spamfilter": {
     "message": "Choose the accounts where the spam filter is enabled",
     "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_project": {
+    "message": "ChatGPT Web project",
+    "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_project_info": {
+    "message": "This is the project that will be enforced for the ChatGPT Web Interface.",
+    "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_custom_gpt": {
+    "message": "ChatGPT Web custom GPT",
+    "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_custom_gpt_info": {
+    "message": "This is the custom GPT that will be enforced for the ChatGPT Web Interface.",
+    "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_custom_data_info": {
+    "message": "This must be in the following form:",
+    "description": ""
+  },
+  "prefs_OptionText_chatgpt_web_custom_data_info2": {
+    "message": "You can find the correct value in the browser URL field when you open the related ChatGPT page.",
+    "description": ""
   }
 }
\ No newline at end of file
diff --git a/options/mzta-options-default.js b/options/mzta-options-default.js
index 501b0254..3f9fe33b 100644
--- a/options/mzta-options-default.js
+++ b/options/mzta-options-default.js
@@ -25,6 +25,8 @@ export const prefs_default = {
     connection_type: 'chatgpt_web',     //Other values: 'chatgpt_api', 'ollama_api', 'openai_comp_api', 'google_gemini_api'
     chatgpt_web_model: '',
     chatgpt_web_tempchat: false,
+    chatgpt_web_project: '',
+    chatgpt_web_custom_gpt: '',
     chatgpt_api_key: '',
     chatgpt_model: '',
     chatgpt_developer_messages: '',
diff --git a/options/mzta-options.css b/options/mzta-options.css
index e556eee2..f30c0f42 100644
--- a/options/mzta-options.css
+++ b/options/mzta-options.css
@@ -74,6 +74,10 @@ span.dims_label{
     display: inline-block;
 }
 
+span.opt_title{
+    font-weight: bold;
+}
+
 #btn_custom_prompts{
     text-align: center;
     width: 100%;
diff --git a/options/mzta-options.html b/options/mzta-options.html
index 08d987b1..763b4efb 100644
--- a/options/mzta-options.html
+++ b/options/mzta-options.html
@@ -18,7 +18,7 @@
         <td colspan="2" style="text-align:center;" class="warning"><b>__MSG_hyprland_warning__</b></td>
       </tr>
       <tr>
-        <td><span>__MSG_prefs_OptionText_chatgpt_win_text__</span>
+        <td><span class="opt_title">__MSG_prefs_OptionText_chatgpt_win_text__</span>
         <td>
           <label>
             <span class="dims_label">__MSG_prefs_OptionText_chatgpt_win_height__</span>
@@ -35,7 +35,7 @@
       </tr>
       <tr>
         <td><label>
-          <span>__MSG_prefs_OptionText_default_sign_name__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_default_sign_name__</span>
         </label></td>
         <td>
           <label>
@@ -45,7 +45,7 @@
       </tr>
       <tr>
         <td><label>
-          <span>__MSG_prefs_OptionText_default_chatgpt_lang__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_default_chatgpt_lang__</span>
         </label></td>
         <td>
           <label>
@@ -56,7 +56,7 @@
       <tr>
         <td>
           <label>
-            <span>__MSG_prefs_OptionText_reply_type__</span>
+            <span class="opt_title">__MSG_prefs_OptionText_reply_type__</span>
           </label>
         </td>
         <td>
@@ -70,7 +70,7 @@
       </tr>
       <tr>
         <td><label>
-          <span>__MSG_prefs_OptionText_dynamic_menu_order_alphabet__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_dynamic_menu_order_alphabet__</span>
         </label></td>
         <td>
           <label>
@@ -81,7 +81,7 @@
       </tr>
       <tr>
         <td><label>
-          <span>__MSG_prefs_OptionText_dynamic_menu_force_enter__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_dynamic_menu_force_enter__</span>
         </label></td>
         <td>
           <label>
@@ -92,7 +92,7 @@
       </tr>
       <tr>
         <td><label>
-          <span>__MSG_prefs_OptionText_placeholders_use_default_value__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_placeholders_use_default_value__</span>
         </label></td>
         <td>
           <label>
@@ -104,7 +104,7 @@
       <tr>
         <td>
           <label>
-            <span>__MSG_prefs_Connection_type__</span>
+            <span class="opt_title">__MSG_prefs_Connection_type__</span>
           </label>
         </td>
         <td>
@@ -122,7 +122,7 @@
       <tr>
       <tr class="conntype_chatgpt_web">
         <td><label>
-          <span>__MSG_prefs_OptionText_chatgpt_web_model__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_chatgpt_web_model__</span>
           <br><table title="__MSG_prefs_OptionText_chatgpt_web_model_tooltip__"><tr><td><i class="small_info"><nobr>__MSG_AllowedValues__:</nobr></i></td><td><i class="small_info"> &nbsp; <nobr class="conntype_chatgpt_web_option">gpt-4o</nobr> &nbsp; <nobr class="conntype_chatgpt_web_option">gpt-4o-mini</nobr> &nbsp; <nobr class="conntype_chatgpt_web_option">gpt-4</nobr> &nbsp; <nobr class="conntype_chatgpt_web_option">o1</nobr> &nbsp; <nobr class="conntype_chatgpt_web_option">o3-mini</nobr> &nbsp; <nobr class="conntype_chatgpt_web_option">o3-mini-high</nobr></i></td></tr></table>
         </label></td>
         <td>
@@ -134,7 +134,33 @@
       </tr>
       <tr class="conntype_chatgpt_web">
         <td><label>
-          <span>__MSG_prefs_OptionText_chatgpt_web_tempchat__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_chatgpt_web_project__</span>
+          <br><i class="small_info" id="chatgpt_web_project_info">__MSG_prefs_OptionText_chatgpt_web_custom_data_info__ <b>/g/PROJECT_ID-PROJECT_NAME/project</b>
+            <br>__MSG_prefs_OptionText_chatgpt_web_custom_data_info2__</i>
+        </label></td>
+        <td>
+          <label>
+            <input type="text" id="chatgpt_web_project" name="chatgpt_web_project" class="option-input" />
+            <br>__MSG_prefs_OptionText_chatgpt_web_project_info__
+          </label>
+        </td>
+      </tr>
+      <tr class="conntype_chatgpt_web">
+        <td><label>
+          <span class="opt_title">__MSG_prefs_OptionText_chatgpt_web_custom_gpt__</span>
+          <br><i class="small_info" id="chatgpt_web_custom_gpt_info">__MSG_prefs_OptionText_chatgpt_web_custom_data_info__ <b>/g/CUSTOM_GPT_ID</b>
+            <br>__MSG_prefs_OptionText_chatgpt_web_custom_data_info2__</i>
+        </label></td>
+        <td>
+          <label>
+            <input type="text" id="chatgpt_web_custom_gpt" name="chatgpt_web_custom_gpt" class="option-input" />
+            <br>__MSG_prefs_OptionText_chatgpt_web_custom_gpt_info__
+          </label>
+        </td>
+      </tr>
+      <tr class="conntype_chatgpt_web">
+        <td><label>
+          <span class="opt_title">__MSG_prefs_OptionText_chatgpt_web_tempchat__</span>
         </label></td>
         <td>
           <label>
@@ -145,7 +171,7 @@
       </tr>
       <tr class="conntype_chatgpt_web">
         <td><label>
-          <span>__MSG_OpenChatGPTTab_Info__</span>
+          <span class="opt_title">__MSG_OpenChatGPTTab_Info__</span>
         </label></td>
         <td>
             <button id="btnChatGPTWeb_Tab">__MSG_OpenChatGPTTab__</button>
@@ -153,7 +179,7 @@
       </tr>
       <tr class="conntype_chatgpt_api">
         <td><label>
-          <span>__MSG_prefs_ChatGPT_API_Key__</span>
+          <span class="opt_title">__MSG_prefs_ChatGPT_API_Key__</span>
         </label></td>
         <td>
           <div class="api_key-container">
@@ -167,7 +193,7 @@
       <tr class="conntype_chatgpt_api">
         <td>
           <label>
-            <span>__MSG_ChatGPT_Models__</span>
+            <span class="opt_title">__MSG_ChatGPT_Models__</span>
           </label>
         </td>
         <td>
@@ -181,7 +207,7 @@
       <tr class="conntype_chatgpt_api">
         <td>
           <label>
-            <span>__MSG_ChatGPT_Developer_Messages__</span>
+            <span class="opt_title">__MSG_ChatGPT_Developer_Messages__</span>
           </label>
         </td>
         <td>
@@ -193,7 +219,7 @@
       </tr>
       <tr class="conntype_google_gemini_api">
         <td><label>
-          <span>__MSG_prefs_GoogleGemini_API_Key__</span>
+          <span class="opt_title">__MSG_prefs_GoogleGemini_API_Key__</span>
         </label></td>
         <td>
           <div class="api_key-container">
@@ -207,7 +233,7 @@
       <tr class="conntype_google_gemini_api">
         <td>
           <label>
-            <span>__MSG_GoogleGemini_Models__</span>
+            <span class="opt_title">__MSG_GoogleGemini_Models__</span>
           </label>
         </td>
         <td>
@@ -221,7 +247,7 @@
       <tr class="conntype_google_gemini_api">
         <td>
           <label>
-            <span>__MSG_GoogleGemini_SystemInstruction__</span>
+            <span class="opt_title">__MSG_GoogleGemini_SystemInstruction__</span>
           </label>
         </td>
         <td>
@@ -233,7 +259,7 @@
       </tr>
       <tr class="conntype_ollama_api">
         <td><label>
-          <span>__MSG_prefs_API_Host__</span>
+          <span class="opt_title">__MSG_prefs_API_Host__</span>
           <br><i class="small_info">__MSG_prefs_API_Host_Info__ http://127.0.0.1:11434</i>
         </label></td>
         <td>
@@ -253,7 +279,7 @@
       <tr class="conntype_ollama_api">
         <td>
           <label>
-            <span>__MSG_Ollama_Models__</span>
+            <span class="opt_title">__MSG_Ollama_Models__</span>
           </label>
         </td>
         <td>
@@ -266,7 +292,7 @@
       </tr>
       <tr class="conntype_openai_comp_api">
         <td><label>
-          <span>__MSG_prefs_API_Host__</span>
+          <span class="opt_title">__MSG_prefs_API_Host__</span>
           <br><i class="small_info">__MSG_prefs_API_Host_Info__ http://localhost:1234</i>
         </label></td>
         <td>
@@ -286,7 +312,7 @@
       </tr>
       <tr class="conntype_openai_comp_api">
         <td><label>
-          <span>__MSG_prefs_OptionText_openai_comp_use_v1__</span>
+          <span class="opt_title">__MSG_prefs_OptionText_openai_comp_use_v1__</span>
         </label></td>
         <td>
           <label>
@@ -297,7 +323,7 @@
       </tr>
       <tr class="conntype_openai_comp_api">
         <td><label>
-          <span>__MSG_prefs_OpenAIComp_API_Key__</span>
+          <span class="opt_title">__MSG_prefs_OpenAIComp_API_Key__</span>
           <br><i class="small_info">__MSG_Optional__</i>
         </label></td>
         <td>
@@ -312,7 +338,7 @@
       <tr class="conntype_openai_comp_api">
         <td>
           <label>
-            <span>__MSG_OpenAIComp_Models__</span>
+            <span class="opt_title">__MSG_OpenAIComp_Models__</span>
             <br><button id="btnOpenAICompForceModel" class="btn_small">__MSG_prefs_OpenAIComp_ForceModel__</button></td>
           </label>
         </td>
@@ -326,7 +352,7 @@
       </tr>
       <tr class="conntype_openai_comp_api">
         <td><label>
-          <span>__MSG_prefs_OpenAIComp_ChatName__</span>
+          <span class="opt_title">__MSG_prefs_OpenAIComp_ChatName__</span>
         </label></td>
         <td>
           <label>
@@ -336,7 +362,7 @@
         </td>
       </tr>
       <tr id="max_prompt_length_tr">
-        <td><span>__MSG_prefs_OptionText_max_prompt_length__</span></td>
+        <td><span class="opt_title">__MSG_prefs_OptionText_max_prompt_length__</span></td>
         <td>
           <label>
             <input type="number" id="max_prompt_length" name="max_prompt_length" class="option-input" />
@@ -345,7 +371,7 @@
         </td>
       </tr>
       <tr class="add_tags_tr">
-        <td><span>__MSG_prefs_OptionText_add_tags__</span>
+        <td><span class="opt_title">__MSG_prefs_OptionText_add_tags__</span>
         <br><button id="btnManageTagsInfo" class="btn_small">__MSG_prefs_OptionText_btnManageTagsInfo__</button></td>
         <td>
           <label>
@@ -355,7 +381,7 @@
         </td>
       </tr>
       <tr class="spamfilter_tr">
-        <td><span>__MSG_prefs_OptionText_spamfilter__</span>
+        <td><span class="opt_title">__MSG_prefs_OptionText_spamfilter__</span>
         <br><button id="btnManageSpamFilterInfo" class="btn_small">__MSG_prefs_OptionText_btnManageSpamFilterInfo__</button></td>
         <td>
           <label>
@@ -365,7 +391,7 @@
         </td>
       </tr>
       <tr class="get_calendar_event_tr">
-        <td><span>__MSG_prefs_OptionText_get_calendar_event__</span>
+        <td><span class="opt_title">__MSG_prefs_OptionText_get_calendar_event__</span>
         <br><button id="btnManageCalendarEventInfo" class="btn_small">__MSG_prefs_OptionText_btnManageCalendarEventInfo__</button></td>
         <td>
           <label>
@@ -375,7 +401,7 @@
         </td>
       </tr>
       <tr class="get_task_tr">
-        <td><span>__MSG_prefs_OptionText_get_task__</span>
+        <td><span class="opt_title">__MSG_prefs_OptionText_get_task__</span>
         <br><button id="btnManageTaskInfo" class="btn_small">__MSG_prefs_OptionText_btnManageTaskInfo__</button></td>
         <td>
           <label>
@@ -393,7 +419,7 @@
       </tr>
       <tr>
         <td style="width:20em"><label>
-          <span>__MSG_Debug__</span>
+          <span class="opt_title">__MSG_Debug__</span>
         </label></td>
         <td>
           <label>
diff --git a/options/mzta-options.js b/options/mzta-options.js
index c4d61f80..7207046d 100644
--- a/options/mzta-options.js
+++ b/options/mzta-options.js
@@ -313,6 +313,12 @@ async function disable_GetCalendarEvent(){
   wrong_sparks_text.style.display = (is_spark_present == 0) ? 'inline' : 'none';
 }
 
+function validateCustomData_ChatGPTWeb(event) {
+  let is_valid = event.target.value.startsWith('/g/') || event.target.value == '';
+  event.target.style.borderColor = is_valid ? 'green' : 'red';
+  document.getElementById(event.target.id + '_info').style.color = is_valid ? '' : 'red';
+}
+
 document.addEventListener('DOMContentLoaded', async () => {
   await restoreOptions();
 
@@ -448,6 +454,8 @@ document.addEventListener('DOMContentLoaded', async () => {
   document.getElementById("ollama_host").addEventListener("change", warn_Ollama_HostEmpty);
   document.getElementById("openai_comp_host").addEventListener("change", warn_OpenAIComp_HostEmpty);
   document.getElementById("google_gemini_api_key").addEventListener("change", warn_GoogleGemini_APIKeyEmpty);
+  document.getElementById("chatgpt_web_project").addEventListener("input", validateCustomData_ChatGPTWeb);
+  document.getElementById("chatgpt_web_custom_gpt").addEventListener("input", validateCustomData_ChatGPTWeb);
 
   let prefs = await browser.storage.sync.get({chatgpt_model: '', ollama_model: '', openai_comp_model: '', google_gemini_model: '', chatgpt_win_height: 0, chatgpt_win_width: 0 });