Add-ons add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird. The term "add-on" includes plugins, extensions, themes, and search engine plug-ins.
The Add-on Manager provides access to add-ons in order to determine what's available, install and remove add-ons, and manage the available add-ons.
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<p><span class="seoSummary"><strong>Add-ons</strong> add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird. The term "add-on" includes <a href="/en-US/docs/Plugins" title="Plugins">plugins</a>, <a href="/en-US/docs/Extensions" title="Extensions">extensions</a>, themes, and <a href="/en-US/docs/Creating_OpenSearch_plugins_for_Firefox" title="Creating OpenSearch plugins for Firefox">search engine plug-ins</a>.</span></p>
<p>The <a href="/en-US/docs/Addons/Add-on_Manager" title="Addons/Add-on Manager">Add-on Manager</a> provides access to add-ons in order to determine what's available, install and remove add-ons, and manage the available add-ons.</p>
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<h2 class="Documentation" id="Documentation" name="Documentation">Documentation</h2>
<dl>
<dt>
<a href="/en-US/docs/Addons/Add-on_Manager" title="Addons/Add-on Manager">Add-on Manager</a> {{gecko_minversion_inline("2.0")}}</dt>
<dd>
Using the Add-on Manager.</dd>
<dt>
<a href="/en-US/docs/Addons/Add-on_Repository" title="Addons/Add-on Repository">Add-on Repository</a> {{gecko_minversion_inline("2.0")}}</dt>
<dd>
The Add-on Repository is used to find available add-ons.</dd>
<dt>
<a href="/en-US/docs/Addons/Interfacing_with_the_Add-on_Repository" title="Addons/Interfacing with the Add-on Repository">Interfacing with the Add-on Repository</a> {{gecko_minversion_inline("2.0")}}</dt>
<dd>
How to use the <a href="/en-US/docs/Addons/Add-on_Repository" title="Addons/Add-on Repository"><code>AddonRepository.jsm</code></a> code module to interact with AMO.</dd>
<dt>
<a href="/en-US/docs/Addons/Working_with_AMO" title="Addons/Working with AMO">Working with AMO</a> {{gecko_minversion_inline("2.0")}}</dt>
<dd>
Tips and suggestions for how to make your add-on work with the <a class="external" href="https://addons.mozilla.org" title="https://addons.mozilla.org/">addons.mozilla.org</a> repository.</dd>
<dt>
<a href="/en-US/docs/Extensions" title="Extensions">Extensions</a></dt>
<dd>
Information about developing extensions for Mozilla applications.</dd>
<dt>
<a href="/en-US/docs/Addons/Add-on_guidelines" title="/en-US/docs/Addons/Add-on_guidelines">Add-on guidelines</a></dt>
<dd>
Guidelines for creating great add-ons that are more likely to be successful!</dd>
<dt>
<a href="/en-US/docs/Plugins" title="Plugins">Plugins</a></dt>
<dd>
How to develop plugins.</dd>
<dt>
<a href="/en-US/docs/Themes" title="Themes">Themes</a></dt>
<dd>
Developing themes (or skins) for Mozilla applications.</dd>
<dt>
<a href="/en-US/docs/Creating_OpenSearch_plugins_for_Firefox" title="Creating OpenSearch plugins for Firefox">Creating OpenSearch plugins for Firefox</a></dt>
<dd>
How to develop search plug-ins for Firefox.</dd>
<dt>
<a href="/en-US/docs/Performance" title="Performance">Performance</a></dt>
<dd>
Performance guides and utilities to help you make your add-on perform well (and to play nicely with others).</dd>
</dl>
<p><span class="alllinks"><a href="/en-US/docs/tag/Add-ons" title="tag/Add-ons">View all pages tagged with "Add-ons"...</a></span></p>
</td>
<td>
<h2 class="Community" id="Community" name="Community">Community</h2>
<ul>
<li>View Mozilla extension development forums... {{DiscussionList("dev-extensions", "mozilla.dev.extensions")}}</li>
<li><a class="link-irc" href="irc://irc.mozilla.org/extdev">#extdev IRC channel</a></li>
<li><a class="external" href="https://forums.mozillazine.org/?c=11">MozillaZine forum</a></li>
<li><a class="external" href="/devnews/index.php/categories/about-addons" title="https://developer.mozilla.org/editor/fckeditor/core/editor/devnews/index.php/categories/about-addons/">about:addons newsletter</a></li>
<li><a class="external" href="/web-tech" title="https://developer.mozilla.org/editor/fckeditor/core/editor/web-tech/">Mozilla's Web-Tech blog</a></li>
<li><a class="external" href="https://mozdev.org/mailman/listinfo/project_owners">mozdev project owners</a></li>
<li><a class="external" href="https://planet.mozilla.org/" title="https://planet.mozilla.org/">Planet Mozilla</a></li>
<li><a href="/en-US/docs/Extensions/Community" title="Extensions/Community">Other community links...</a></li>
</ul>
<h2 class="Tools" id="Tools" name="Tools">Tools</h2>
<ul>
<li><a href="/en-US/docs/DOM_Inspector" title="DOM Inspector">DOM Inspector</a> - inspect DOM, CSS, and XBL (Firefox and Thunderbird)</li>
<li><a class="external" href="https://www.hacksrus.com/~ginda/venkman/" rel="external nofollow" target="_blank" title="https://www.hacksrus.com/~ginda/venkman/">Venkman</a>, a JavaScript debugger (<a class="external" href="https://addons.mozilla.org/en-US/firefox/addon/216" rel="external nofollow" target="_blank" title="https://addons.mozilla.org/en-US/firefox/addon/216">Firefox</a>, <a class="external" href="https://addons.mozilla.org/en-US/thunderbird/addon/216" rel="external nofollow" target="_blank" title="https://addons.mozilla.org/en-US/thunderbird/addon/216">Thunderbird</a>)</li>
<li><a class="link-https" href="https://builder.mozillalabs.com/" title="https://builder.mozillalabs.com/">Mozilla Labs Add-on Builder</a></li>
<li><a class="link-https" href="https://addons.mozilla.org/en-US/firefox/addon/7434/" rel="external nofollow" target="_blank" title="https://addons.mozilla.org/en-US/firefox/addon/7434/">Extension Developer's Extension</a> a suite of development tools</li>
<li><a class="external" href="https://www.gijsk.com/" rel="external nofollow" target="_blank" title="https://www.gijsk.com/">Chrome List</a> view files in chrome:// (<a class="external" href="https://addons.mozilla.org/en-US/firefox/addon/4453" rel="external nofollow" target="_blank" title="https://addons.mozilla.org/en-US/firefox/addon/4453">Firefox</a>, <a class="external" href="https://addons.mozilla.org/en-US/thunderbird/addon/4453" rel="external nofollow" target="_blank" title="https://addons.mozilla.org/en-US/thunderbird/addon/4453">Thunderbird</a>)</li>
<li><a class="external" href="https://ted.mielczarek.org/code/mozilla/extensionwiz/" rel="external nofollow" target="_blank" title="https://ted.mielczarek.org/code/mozilla/extensionwiz/">Extension Wizard</a> a web-based extension skeleton generator (Firefox and Thunderbird)</li>
</ul>
<p>... <a href="/en-US/docs/Setting_up_extension_development_environment#Development_extensions" title="Setting up extension development environment#Development extensions">more tools</a> ...</p>
<h2 class="Related_Topics" id="Related_Topics" name="Related_Topics">Related Topics</h2>
<ul>
<li><a href="/en-US/docs/XUL" title="XUL">XUL</a>, <a href="/en-US/docs/JavaScript" title="JavaScript">JavaScript</a>, <a href="/en-US/docs/XPCOM" title="XPCOM">XPCOM</a>, <a href="/en-US/docs/Themes" title="Themes">Themes</a>, <a href="/en-US/docs/Developer_Guide" title="Developing_Mozilla">Developing Mozilla</a>, <a href="/en-US/docs/Extensions" title="Extensions">Extensions</a></li>
</ul>
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