diff --git a/customprompts/mzta-custom-prompts.css b/customprompts/mzta-custom-prompts.css
index 4d7fb217..5a8e9bb1 100644
--- a/customprompts/mzta-custom-prompts.css
+++ b/customprompts/mzta-custom-prompts.css
@@ -163,6 +163,44 @@ table .sort.desc {
     margin-bottom: 0px;
 }
 
+.autocomplete-container {
+    position: relative;
+}
+
+.autocomplete-list {
+    position: absolute;
+    top: 100%;
+    left: 0;
+    right: 0;
+    background-color: white;
+    border: 1px solid #ccc;
+    z-index: 1000;
+    max-height: 200px;
+    overflow-y: auto;
+    padding: 0;
+    margin: 0;
+    list-style: none;
+    font-size: small;
+}
+
+.autocomplete-list li {
+    padding: 8px;
+    cursor: pointer;
+}
+
+.autocomplete-list li:hover {
+    background-color: #f0f0f0;
+}
+
+.autocomplete-list li.active {
+    background-color: #ddd;
+}
+
+.hidden {
+    display: none;
+}
+  
+
 
 @media (prefers-color-scheme: dark) {
     body {
@@ -196,6 +234,18 @@ table .sort.desc {
 
     .storage_space{
         color: rgb(182, 182, 182);
-    }    
+    }
 
+    .autocomplete-list {
+        background-color: #2E2F36;
+        border: 1px solid #2E2F36;
+    }
+    
+    .autocomplete-list li:hover {
+        background-color: #4c4e58;
+    }
+    
+    .autocomplete-list li.active {
+        background-color: #4c4e58;
+    }
 }
\ No newline at end of file
diff --git a/customprompts/mzta-custom-prompts.html b/customprompts/mzta-custom-prompts.html
index 22055da4..513ec5e9 100644
--- a/customprompts/mzta-custom-prompts.html
+++ b/customprompts/mzta-custom-prompts.html
@@ -34,7 +34,10 @@
             <td rowspan="2" class="w25">
                 <label for="txtTextNew">*__MSG_customPrompts_form_label_Text__:</label>
                 <br>
-                <textarea id="txtTextNew" name="text" class="input_new text_output" tabindex="3"></textarea>
+                <div class="autocomplete-container">
+                    <textarea id="txtTextNew" name="text" class="input_new text_output editor" tabindex="3"></textarea>
+                    <ul class="autocomplete-list hidden"></ul>
+                </div>
             </td>
             <td class="w19">
                 <label for="selectTypeNew">__MSG_customPrompts_add_to_menu__:</label>
diff --git a/customprompts/mzta-custom-prompts.js b/customprompts/mzta-custom-prompts.js
index 50dc438a..443fc8b0 100644
--- a/customprompts/mzta-custom-prompts.js
+++ b/customprompts/mzta-custom-prompts.js
@@ -19,6 +19,7 @@
 import { getPrompts, setDefaultPromptsProperties, setCustomPrompts, preparePromptsForExport, preparePromptsForImport } from "../js/mzta-prompts.js";
 import { isThunderbird128OrGreater, getCustomPromptsUsedSpace } from "../js/mzta-utils.js";
 import { taLogger } from "../js/mzta-logger.js";
+import { getPlaceholders } from "../js/mzta-placeholders.js";
 
 var promptsList = null;
 var somethingChanged = false;
@@ -27,6 +28,7 @@ var positionMax_display = 0;
 var idnumMax = 0;
 var msgTimeout = null;
 let taLog = null;
+let autocompleteSuggestions = [];
 
 document.addEventListener('DOMContentLoaded', async () => {
 
@@ -111,6 +113,13 @@ document.addEventListener('DOMContentLoaded', async () => {
         });
     }
 
+    const textareas = document.querySelectorAll('.editor');
+    autocompleteSuggestions = (await getPlaceholders(true)).map(p => '{%'+p.id+'%}');
+
+    // console.log('>>>>>>>>>>> suggestions: ' + JSON.stringify(suggestions));
+    
+    textareas.forEach(textarea => textareaAutocomplete(textarea, autocompleteSuggestions));
+
     i18n.updateDocument();
 
     //To add a new item
@@ -274,7 +283,9 @@ function showItemRowEditor(tr) {
     tr.querySelector('.id_show').style.display = 'none';
     tr.querySelector('.name_output').style.display = 'inline';
     tr.querySelector('.name_show').style.display = 'none';
-    tr.querySelector('.text_output').style.display = 'inline';
+    const text_output = tr.querySelector('.text_output');
+    text_output.style.display = 'inline';
+    textareaAutocomplete(text_output, autocompleteSuggestions)
     tr.querySelector('.text_show').style.display = 'none';
     tr.querySelector('.type_output').style.display = 'inline';
     tr.querySelector('.type_show').style.display = 'none';
@@ -399,7 +410,7 @@ function loadPromptsList(values){
             let output = `<tr ` + ((values.is_default == 1) ? 'class="is_default"':'') + `>
                 <td class="w08"><span class="id id_show"></span><input type="text" class="hiddendata id_output" value="` + values.id + `" /></td>
                 <td class="w08"><span class="name name_show"></span><input type="text" class="hiddendata name_output" value="` + values.name + `" /></td>
-                <td class="w40"><span class="text text_show"></span><textarea class="hiddendata text_output">` + values.text + `</textarea></td>
+                <td class="w40"><span class="text text_show"></span><div class="autocomplete-container"><textarea class="hiddendata text_output editor">` + values.text + `</textarea><ul class="autocomplete-list hidden"></ul></div></td>
                 <td class="w08"><span class="type_show">` + type_output + `</span>
                 <select class="type_output hiddendata">
                 <option value="0"` + ((values.type == "0") ? ' selected':'') + `>__MSG_customPrompts_add_to_menu_always__</option>
@@ -642,3 +653,95 @@ if(await isThunderbird128OrGreater()){
         }
     });    
 }
+
+function textareaAutocomplete(textarea, suggestions) {
+    const container = textarea.closest('.autocomplete-container');
+    const autocompleteList = container.querySelector('.autocomplete-list');
+    let activeIndex = -1;
+
+    textarea.addEventListener('input', () => {
+      const cursorPosition = textarea.selectionStart;
+      const text = textarea.value.substring(0, cursorPosition);
+      const match = text.match(/{%[^\s]*$/);
+
+      if (match) {
+        const lastWord = match[0];
+        const matches = suggestions.filter(s => s.startsWith(lastWord));
+        showSuggestions(matches, autocompleteList);
+      } else {
+        hideSuggestions(autocompleteList);
+      }
+    });
+
+    textarea.addEventListener('keydown', (e) => {
+      const items = autocompleteList.querySelectorAll('li');
+      if (items.length > 0) {
+        if (e.key === 'ArrowDown') {
+          e.preventDefault();
+          activeIndex = (activeIndex + 1) % items.length;
+          updateActiveSuggestion(items, activeIndex);
+        } else if (e.key === 'ArrowUp') {
+          e.preventDefault();
+          activeIndex = (activeIndex - 1 + items.length) % items.length;
+          updateActiveSuggestion(items, activeIndex);
+        } else if (e.key === 'Enter') {
+          e.preventDefault();
+          if (activeIndex >= 0 && activeIndex < items.length) {
+            insertAutocomplete(items[activeIndex].textContent, textarea);
+            hideSuggestions(autocompleteList);
+          }
+        } else if (e.key === 'Escape') {
+          hideSuggestions(autocompleteList);
+        }
+      }
+    });
+
+    function showSuggestions(matches, autocompleteList) {
+      autocompleteList.innerHTML = '';
+      activeIndex = -1;
+      if (matches.length === 0) {
+        hideSuggestions(autocompleteList);
+        return;
+      }
+      matches.forEach(match => {
+        const li = document.createElement('li');
+        li.textContent = match;
+        li.addEventListener('click', () => {
+          insertAutocomplete(match, textarea);
+          hideSuggestions(autocompleteList);
+        });
+        autocompleteList.appendChild(li);
+      });
+      autocompleteList.classList.remove('hidden');
+    }
+
+    function hideSuggestions(autocompleteList) {
+      autocompleteList.classList.add('hidden');
+      activeIndex = -1;
+    }
+
+    function updateActiveSuggestion(items, activeIndex) {
+      items.forEach((item, index) => {
+        item.classList.remove('active');
+        if (index === activeIndex) {
+          item.classList.add('active');
+          item.scrollIntoView({ block: 'nearest' });
+        }
+      });
+    }
+
+    function insertAutocomplete(suggestion, textarea) {
+      const cursorPosition = textarea.selectionStart;
+      const textBefore = textarea.value.substring(0, cursorPosition);
+      const textAfter = textarea.value.substring(cursorPosition);
+      const match = textBefore.match(/{%[^\s]*$/);
+      if (match) {
+        const lastWord = match[0];
+        const completion = suggestion.substring(lastWord.length);
+        const newText = textBefore + completion + textAfter;
+        textarea.value = newText;
+        const newCursorPosition = cursorPosition + completion.length;
+        textarea.setSelectionRange(newCursorPosition, newCursorPosition);
+      }
+    }
+}
\ No newline at end of file