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+---
+title: Overlay extensions
+slug: Mozilla/Add-ons/Overlay_Extensions
+tags:
+  - Add-ons
+  - Extensions
+  - Landing
+  - NeedsTranslation
+  - TopicStub
+translation_of: Archive/Add-ons/Overlay_Extensions
+---
+<p>This page contains links to documentation for the approach to developing extensions for Gecko-based applications which uses:</p>
+<ul>
+ <li>XUL overlays to specify the interface</li>
+ <li>APIs available to privileged code such as <a href="/en-US/docs/XUL/tabbrowser"><code>tabbrowser</code></a> and <a href="/en-US/docs/Mozilla/JavaScript_code_modules">JavaScript modules</a> to interact with the application and content.</li>
+</ul>
+<p>Before Gecko 2.0 was released this was the only way to develop extensions. Now there are two alternative techniques: <a href="/en-US/docs/Extensions/Bootstrapped_extensions">restartless extensions</a> and <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/latest/">Add-on SDK-based extensions</a>. The privileged JavaScript APIs described here can still be used by the newer techniques.</p>
+<h2 id="XUL_School">XUL School</h2>
+<p><a href="/en-US/Add-ons/Overlay_Extensions/XUL_School">XUL School</a> is a comprehensive add-on development tutorial, focusing on Firefox extension development but mostly applicable to other Gecko-based applications.</p>
+<h2 id="More_resources">More resources</h2>
+<div class="column-container">
+ <div class="column-half">
+  <dl>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Setting_up_extension_development_environment">Setting up your environment</a></dt>
+   <dd>
+    Setting up the application for extension development.</dd>
+   <dt>
+    <a href="/en-US/docs/XUL">XUL</a></dt>
+   <dd>
+    Tutorials and reference for the user interface language used by XUL extensions.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Code_snippets">Code snippets</a></dt>
+   <dd>
+    Sample code for many of the things you'll want to do.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Installing_extensions">Installing extensions</a></dt>
+   <dd>
+    How to install an extension by copying the extension files into the application's install directory.</dd>
+   <dt>
+    <a href="/en-US/Add-ons/Overlay_extensions/Firefox_addons_developer_guide">Firefox add-ons developer guide</a></dt>
+   <dd>
+    A guide to developing overlay extensions.</dd>
+  </dl>
+ </div>
+ <div class="column-half">
+  <dl>
+   <dt>
+    <a href="/en-US/docs/Mozilla/JavaScript_code_modules">JavaScript code modules</a></dt>
+   <dd>
+    JavaScript modules available to extension developers.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Inline_Options">Extension preferences</a></dt>
+   <dd>
+    How to specify the preferences for your extension that will appear in the Add-ons Manager.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Extension_Frequently_Asked_Questions">Frequently Asked Questions</a></dt>
+   <dd>
+    Common issues with extension development.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Extension_Packaging">Extension packaging</a></dt>
+   <dd>
+    How extensions are packaged and installed.</dd>
+   <dt>
+    <a href="/en-US/Mozilla/Add-ons/Creating_Custom_Firefox_Extensions_with_the_Mozilla_Build_System">Binary Firefox extensions</a></dt>
+   <dd>
+    Creating binary extensions for Firefox.</dd>
+  </dl>
+ </div>
+</div>
+<p> </p>