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diff --git a/files/ko/extensions/community/index.html b/files/ko/extensions/community/index.html
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+++ b/files/ko/extensions/community/index.html
@@ -0,0 +1,18 @@
+---
+title: Community
+slug: Extensions/Community
+tags:
+  - Add-ons
+  - Extensions
+translation_of: Extensions/Community
+---
+<p>혹시 <a href="ko/Extensions">확장기능 개발</a>과 관련하여 쓸모 있는 mailing list, newsgroup, 포럼이나 다른 커뮤니티를 아시면, 여기에 링크해 주세요.</p>
+<ul>
+ <li><a class="external" href="http://forums.mozillazine.org/?c=11">MozillaZine Extensions &amp; Themes forum</a></li>
+ <li><a class="link-irc" href="irc://moznet/%23extdev">#extdev channel on moznet IRC network</a></li>
+ <li><a class="external" href="http://mozdev.org/mailman/listinfo/project_owners">mozdev project owners mailing list</a></li>
+ <li><a class="external" href="http://kb.mozillazine.org/Extension_development">Mozillazine Knowledge Base</a></li>
+ <li><a class="external" href="http://allyourideas.com/index.php?title=Category:Firefox_extension">AllYourIdeas</a> - 확장기능용 아이디어</li>
+ <li><a class="external" href="http://babelzilla.org/">BabelZilla</a> - Mozilla 용용프로그램용 확장기능 개발자와 번역자를 위한 커뮤니티</li>
+</ul>
+<p>{{ languages( { "en": "en/Extensions/Community", "fr": "fr/Extensions/Communaut\u00e9" } ) }}</p>
diff --git a/files/ko/extensions/index.html b/files/ko/extensions/index.html
new file mode 100644
index 0000000000..5c095c6e0b
--- /dev/null
+++ b/files/ko/extensions/index.html
@@ -0,0 +1,72 @@
+---
+title: 확장기능
+slug: Extensions
+tags:
+  - Add-ons
+  - Extensions
+translation_of: Mozilla/Add-ons
+---
+<p> </p>
+<div class="callout-box">
+<p><b><a href="ko/Building_an_Extension">확장기능 만들기</a></b><br>
+단계별로 어떻게 Firefox용 확장기능을 만드는지 설명합니다.
+</p>
+</div>
+<div>
+<p><b>확장기능</b>(Extensions)은 Firefox와 Thunderbird 같은 Mozilla 응용프로그램에 새로운 기능을 추가하는 작은 부가 기능입니다. 도구 표시줄 버튼부터 완전히 새로운 기능까지 무엇이든 추가할 수 있습니다. 확장기능은 응용프로그램 자체의 용량을 줄이고 개별 사용자가 부가 기능이 필요하면 응용프로그램을 수정하거나 개선할 수 있게 합니다.
+</p>
+</div>
+<table class="topicpage-table">
+<tbody><tr><td>
+<h3 id=".EB.AC.B8.EC.84.9C" name=".EB.AC.B8.EC.84.9C"> <a>문서</a> </h3>
+<dl><dt> <a href="ko/Extension_Frequently_Asked_Questions">확장기능에 관해 자주 하는 질문</a>
+</dt><dd> <small>확장기능 개발에 관한 일반 문답.</small>
+</dd></dl>
+<dl><dt> <a href="ko/Setting_up_extension_development_environment"> 확장기능 개발 환경 구축</a>
+</dt><dd> <small>확장기능 개발 환경 구축을 쉽게 하기 위한 몇 가지 도움말.</small>
+</dd></dl>
+<dl><dt> <a href="ko/Extension_Packaging">확장기능 패키징</a>
+</dt><dd> <small>내려받기와 설치를 위해 Firefox 확장기능 꾸리는 법. </small>
+</dd></dl>
+<dl><dt> <a href="ko/Creating_Custom_Firefox_Extensions_with_the_Mozilla_Build_System">Mozilla 빌드 시스템으로 사용자 정의 Firefox 확장기능 만들기</a>
+</dt><dd> <small>바이너리 컴포넌트를 사용 확장기능 빌드 환경 구축하는 법. </small>
+</dd></dl>
+<dl><dt> <a href="ko/Updating_extensions_for_Firefox_3"> Firefox 3에 맞춰 확장 기능 고치기</a>
+</dt><dd> <small>확장 기능에 영향을 줄 수 있는 Firefox 3의 변경 사항들과 관련 문서에 대한 링크들.</small>
+</dd></dl>
+<dl><dt> <a href="ko/Code_snippets">Code snippets</a>
+</dt><dd> <small>많은 확장기능이 보통 쓰는 코드. 더 많은 예제는 <a>Category:Extensions</a>의 문서를 같이 보세요.</small>
+</dd></dl>
+<p><span class="alllinks"><a>View All...</a></span>
+</p>
+</td>
+<td>
+<h3 id=".EC.BB.A4.EB.AE.A4.EB.8B.88.ED.8B.B0" name=".EC.BB.A4.EB.AE.A4.EB.8B.88.ED.8B.B0"> 커뮤니티 </h3>
+<ul><li> Mozilla 포럼 보기...
+</li></ul>
+<p>{{ DiscussionList("dev-extensions", "mozilla.dev.extensions") }}
+</p>
+<ul><li> <a class="link-irc" href="irc://irc.mozilla.org/extdev">#extdev IRC channel</a>
+</li><li> <a class="external" href="http://forums.mozillazine.org/?c=11">MozillaZine forum</a>
+</li><li> <a class="external" href="http://mozdev.org/mailman/listinfo/project_owners">mozdev project owners</a>
+</li><li> <a href="ko/Extensions/Community">Other community links...</a>
+</li></ul>
+<h3 id=".EA.B0.9C.EB.B0.9C_.EB.8F.84.EA.B5.AC" name=".EA.B0.9C.EB.B0.9C_.EB.8F.84.EA.B5.AC"> 개발 도구 </h3>
+<ul><li> <a class="external" href="http://ted.mielczarek.org/code/mozilla/extensiondev/">Extension Developer's Extension</a>
+</li><li> <a href="ko/DOM_Inspector">DOM Inspector</a>
+</li><li> <a href="ko/Venkman">Venkman</a>, JavaScript 디버거
+</li><li> <a class="external" href="http://ted.mielczarek.org/code/mozilla/extensionwiz/">Extension Wizard</a>
+</li><li> <a class="external" href="http://www.spket.com/">Spket IDE</a>, 확장기능 개발용 IDE
+</li></ul>
+<p><span class="alllinks"><a>View All...</a></span>
+</p>
+<h3 id=".EA.B4.80.EB.A0.A8_.EC.A3.BC.EC.A0.9C" name=".EA.B4.80.EB.A0.A8_.EC.A3.BC.EC.A0.9C"> 관련 주제 </h3>
+<dl><dd> <a href="ko/XUL">XUL</a>, <a href="ko/JavaScript">JavaScript</a>, <a href="ko/XPCOM">XPCOM</a>, <a href="ko/Themes">Themes</a>, <a href="ko/Developing_Mozilla">Developing Mozilla</a>
+</dd></dl>
+</td>
+</tr>
+</tbody></table>
+<p><span class="comment">Categories</span>
+</p><p><span class="comment">Interwiki Language Links</span>
+</p><p><br>
+</p>{{ languages( { "en": "en/Extensions", "es": "es/Extensiones", "fr": "fr/Extensions", "it": "it/Estensioni", "ja": "ja/Extensions", "pl": "pl/Rozszerzenia", "pt": "pt/Extens\u00f5es" } ) }}
diff --git a/files/ko/extensions/thunderbird/building_a_thunderbird_extension_4_colon__chrome_manifest/index.html b/files/ko/extensions/thunderbird/building_a_thunderbird_extension_4_colon__chrome_manifest/index.html
new file mode 100644
index 0000000000..37184fd45b
--- /dev/null
+++ b/files/ko/extensions/thunderbird/building_a_thunderbird_extension_4_colon__chrome_manifest/index.html
@@ -0,0 +1,28 @@
+---
+title: 'Building a Thunderbird extension 4: chrome manifest'
+slug: 'Extensions/Thunderbird/Building_a_Thunderbird_extension_4:_chrome_manifest'
+translation_of: >-
+  Mozilla/Thunderbird/Thunderbird_extensions/Building_a_Thunderbird_extension_4:_chrome_manifest
+---
+<p>The file called <code>chrome.manifest</code> tells Thunderbird what packages and overlays are provided by the extension. Open the file called <code>chrome.manifest</code> that you created and add this code:</p>
+<pre class="eval">content     myfirstext    chrome/content/
+</pre>
+<ul>
+ <li><code><strong>content</strong></code> specifies the type of material in the package</li>
+ <li><code><strong>myfirstext</strong></code> is the name of the chrome package (specified in the first segment of <code>&lt;em:id&gt;</code> in the <code>install.rdf</code> file</li>
+ <li><code><strong>chrome/content/</strong></code> is the location of the package's files within the <code>chrome</code> namespace</li>
+</ul>
+<p>So, this line says that for a chrome package <code><strong>myfirstext</strong></code>, we can find its <strong>content</strong> files in the directory <code style="font: normal normal normal 100%/normal 'Courier New', 'Andale Mono', monospace; color: inherit; font-weight: inherit;">chrome</code>/<code>content</code>/ (which is a path relative to the location of <code>chrome.manifest</code>).</p>
+<p>To change the Thunderbird user interface to support the extension, you create an overlay and then merge it with the default Thunderbird interface. Later in the tutorial we will create a XUL overlay file that will merge with the default <code>messenger.xul</code> file. At this point we are going to specify in <code>chrome.manifest</code> the existence of the overlay (which we will create later).</p>
+<p>Add this line at the end of <code>chrome.manifest:</code></p>
+<div id="section_8">
+ <pre class="eval">overlay <a class="external" rel="freelink">chrome://messenger/content/messenger.xul</a> <a class="external" rel="freelink">chrome://myfirstext/content/myhelloworld.xul</a>
+</pre>
+ This tells Thunderbird to merge <code>myhelloworld.xul</code> into <code>messenger.xul</code> when <code>messenger.xul</code> loads. For more information on chrome manifests and the properties they support, see the <a href="../../../../en/Chrome_Registration" rel="internal">Chrome Manifest</a> Reference.
+ <p> </p>
+ <p>If you used the Add-On Builder as described in the <a class="internal" href="/en/Extensions/Thunderbird/Building_a_Thunderbird_extension_2:_extension_filesystem" title="en/Extensions/Thunderbird/Building a Thunderbird extension 2: extension filesystem">previous step</a>, open the <code>chrome.manifest</code> file that was in the archive package in a text editor. You will see the <code>content</code> line at the top of the file. Add the <code>overlay</code> line at the bottom of the file. It doesn't matter if there are other <code>overlay</code> lines in the file.</p>
+</div>
+<div class="note">
+ It can be useful to install an add-on such as the <a href="/en/DOM_Inspector" title="en/DOM Inspector"><strong>DOM Inspector</strong></a> to better understand the layout of existing XUL files and to debug your own overlays.</div>
+<p>{{ Previous("Extensions/Thunderbird/Building_a_Thunderbird_extension_3:_install_manifest") }}</p>
+<p>{{ Next("Extensions/Thunderbird/Building_a_Thunderbird_extension_5:_XUL") }}</p>
diff --git a/files/ko/extensions/thunderbird/index.html b/files/ko/extensions/thunderbird/index.html
new file mode 100644
index 0000000000..8c10f366f3
--- /dev/null
+++ b/files/ko/extensions/thunderbird/index.html
@@ -0,0 +1,112 @@
+---
+title: Thunderbird extensions
+slug: Extensions/Thunderbird
+tags:
+  - Add-ons
+  - Extensions
+  - NeedsTranslation
+  - TopicStub
+  - thunderbird
+translation_of: Mozilla/Thunderbird/Thunderbird_extensions
+---
+<div class="callout-box">
+  <strong><a href="/en/Extensions/Thunderbird/Building_a_Thunderbird_extension" title="en/Building_a_Thunderbird_extension">Building a Thunderbird extension</a></strong><br>
+  Step-by-step explanation on how to build an extension for Thunderbird.</div>
+<div>
+  The following documentation provides help for creating extensions for Mozilla's <a class="internal" href="/en/Thunderbird" title="En/Thunderbird">Thunderbird</a> email client. Although there are many similarities with <a href="/en/Extensions" title="en/Extensions">Firefox extensions</a> there are also some differences that may confound the starting developer.</div>
+<div>
+  <br>
+  <strong>Please help!</strong> You can <a class="internal" href="/en/Extensions/Thunderbird/HowTos" title="en/Extensions/Thunderbird/HowTos">add a how-to</a> (a question or an answer or a code snippet), <a class="internal" href="/en/Extensions/Thunderbird/Useful_newsgroups_discussions" title="En/Extensions/Thunderbird/Useful newsgroups discussions">summarize and link to a relevant newsgroup discussion</a>, or create a tutorial. Need help? Contact <a class="internal" href="/User:jenzed" title="User:jenzed">jenzed</a>.</div>
+<table class="topicpage-table">
+  <tbody>
+    <tr>
+      <td>
+        <h2 id="Documentation" name="Documentation"><a href="/Special:Tags?tag=Extensions&amp;language=en" title="Special:Tags?tag=Extensions&amp;language=en">Documentation</a></h2>
+        <h3 id="Getting_started_with_Thunderbird">Getting started with Thunderbird</h3>
+        <p>A brave, young developer wants to develop an addon for Thunderbird. Here's a few links to help them through this journey.</p>
+        <ul>
+          <li>Start by reading the tutorial and learn how to<a class="internal" href="/en/Extensions/Thunderbird/Building_a_Thunderbird_extension" title="En/Building a Thunderbird extension"> build a Thunderbird extension</a> (Outdated, still talks about overlays and the ad-on builder has changed but the tutorial has not been updated.)</li>
+          <li>Read about the <a href="/en/Thunderbird/Main_Windows" title="Main Windows">main windows</a> so that you know what one means when they say « thread pane », « preview pane », and « folder pane ».</li>
+          <li>Read an <a class="external" href="http://blog.xulforum.org/index.php?post/2011/01/03/An-overview-of-Thunderbird-Conversations" title="http://blog.xulforum.org/index.php?post/2011/01/03/An-overview-of-Thunderbird-Conversations">overview</a> of how the various parts of Thunderbird fit together, this really helps get a better understanding of Thunderbird.</li>
+          <li>Want to do some real stuff? See <a class="external" href="http://blog.xulforum.org/index.php?post/2011/03/14/Basic-MimeMessage-demo" title="http://blog.xulforum.org/index.php?post/2011/03/14/Basic-MimeMessage-demo">how to inspect a message</a> (demo addon included!)</li>
+          <li>Play with our other <a href="/en/Extensions/Thunderbird/Demo_Addon" title="Demo Addon">demo addon</a> that exercises some more advanced Thunderbird-specific features</li>
+          <li>Want to do even more stuff? Don't reinvent the wheel: steal functions from the <a class="link-https" href="https://github.com/protz/thunderbird-stdlib" title="https://github.com/protz/thunderbird-stdlib">thunderbird-stdlib</a> project (doc <a class="external" href="http://protz.github.com/thunderbird-stdlib/doc/symbols/_global_.html" title="http://protz.github.com/thunderbird-stdlib/doc/symbols/_global_.html">here</a>). Functions for dealing with messages (delete them, archive them, change their tags, etc.) are included.</li>
+          <li>Haven't found what you're looking for? Read the <a class="internal" href="/en/Extensions/Thunderbird/HowTos" rel="internal" title="en/Extensions/Thunderbird/HowTos">Thunderbird how-tos</a>; they contain a lot of recipes for things extensions want to do.</li>
+          <li>Still haven't managed to do what you wanted? See the list of all <a class="external" href="http://wiki.mozilla.org/Thunderbird/CommunicationChannels" title="http://wiki.mozilla.org/Thunderbird/CommunicationChannels">Thunderbird communication channels </a>so that you know where to ask when you get stuck :-).</li>
+          <li>Feeling really brave? Read the source using a <a class="external" href="http://doxygen.db48x.net/comm-central/html/" title="http://doxygen.db48x.net/comm-central/html/">fancy interface</a>; you can often find tests that demonstrate how to do what you're trying to achieve.</li>
+        </ul>
+        <h3 id="The_Gloda_database">The Gloda database</h3>
+        <p>Thunderbird has a subsystem called Gloda. Gloda stands for « Global Database », and creates Thunderbird-wide relations between objects. Gloda provides concepts such as Conversations, Messages, Identities, Contacts. All these concepts are related together: a Conversation contains Messages which are linked to Identities (<strong>from</strong> field, <strong>to</strong> field) which are themselves part of a Contact: indeed, a contact has multiple identities.</p>
+        <p>Typical use cases for Gloda: find all messages whose subject matches [search term], find all messages from [person], find all messages in the same thread as [a given message], find all messages involving [person], etc. etc.</p>
+        <p>Gloda is extremely powerful and is used heavily by addons such as <a class="link-https" href="https://addons.mozilla.org/en-US/thunderbird/addon/gmail-conversation-view/" title="https://addons.mozilla.org/en-US/thunderbird/addon/gmail-conversation-view/">Thunderbird Conversations</a>. Learn more about Gloda:</p>
+        <ul>
+          <li>an overview of <a href="/en/Thunderbird/gloda" title="Gloda">Gloda</a></li>
+          <li>learn how to create <a href="/en/Thunderbird/Creating_a_Gloda_message_query" title="Creating a gloda message query">your first message query</a> and read the <a href="/en/Thunderbird/Gloda_examples" title="Gloda examples">gloda examples</a></li>
+          <li>learn about the Gloda internals: <a href="/en/Thunderbird/Gloda_debugging" title="Gloda debugging">Gloda debugging</a>, <a href="/en/Thunderbird/Gloda_indexing" title="Gloda indexing">Gloda indexing</a></li>
+        </ul>
+        <h3 id="More_Thunderbird-specific_links">More Thunderbird-specific links</h3>
+        <p>Some of these links may be wildly out of date, but they still provide valuable information on the codebase.</p>
+        <ul>
+          <li><a class="internal" href="/en/Extensions/Thunderbird/An_overview_of_the_Thunderbird_interface" title="En/Extensions/Thunderbird/An overview of the Thunderbird interface">An overview of Thunderbird components</a></li>
+          <li><a class="internal" href="/en/Extensions/Thunderbird/Thunderbird_developer_reference_docs" title="en/Extensions/Thunderbird/Thunderbird developer reference docs">Developer reference docs</a>:
+            <ul>
+              <li><a class="internal" href="/en/Folders" title="En/Folders">Folder classes</a></li>
+              <li><a class="internal" href="/en/DB_Views_(message_lists)" title="En/DB Views (message lists)">DB views (message list)</a></li>
+              <li><a class="internal" href="/en/Message_Summary_Database" title="En/Message Summary Database">Message summary database</a></li>
+              <li><a class="internal" href="/en/MailNews_Protocols" title="En/MailNews Protocols">MailNews protocols</a></li>
+              <li><a class="internal" href="/En/MailNews%20Filters" rel="internal" title="En/MailNews Filters">MailNews filters</a></li>
+              <li><a class="internal" href="/en/Extensions/Thunderbird/Error_reporting_tools" title="en/Extension Library/Extensions/Thunderbird/Error reporting tools">Error reporting tools</a></li>
+              <li><a href="/en/Toolkit_API/STEEL" title="en/Toolkit API/STEEL">STEEL library</a> (not actively developed anymore, use   <a class="link-https" href="https://github.com/protz/thunderbird-stdlib" title="https://github.com/protz/thunderbird-stdlib">https://github.com/protz/thunderbird-stdlib</a>)</li>
+              <li><a class="external" href="http://quetzalcoatal.blogspot.com/2010/01/developing-new-account-types-part-0.html" title="http://quetzalcoatal.blogspot.com/2010/01/developing-new-account-types-part-0.html">Developing new account types</a> <strong>NEW!</strong></li>
+            </ul>
+          </li>
+          <li><a class="internal" href="/en/Extensions/Thunderbird/Useful_newsgroups_discussions" title="En/Extensions/Thunderbird/Useful newsgroups discussions">Useful newsgroup discussions</a> (watch out, anything that's too old should be regarded suspiciously; there's been significant API rewrite over the past years, and most of these techniques are considerably easier now) </li>
+          <li><a href="/en/Thunderbird/Thunderbird_API_documentation" title="en/Thunderbird/Thunderbird API documentation">Thunderbird API docs</a> (mostly a collection of out-of-date pages, relevance is rather dubious) </li>
+          <li><a href="/En/Thunderbird_3_for_developers" title="En/Thunderbird 3 for developers">Thunderbird 3 for developers</a> and <a href="/en/Thunderbird_3.1_for_developers" title="en/Thunderbird 3.1 for developers">Thunderbird 3.1 for developers</a> - changes in the recent Thunderbird updates affecting add-on developers. <a href="/Thunderbird_5_for_developers" title="Thunderbird 5 for developers">Thunderbird 5 for developers</a> has important information on MsgHdrToMimeMessage which is a central piece of code.</li>
+        </ul>
+        <h3 id="General_links">General links</h3>
+        <ul>
+          <li><a class="internal" href="/en/Extensions" title="en/Extensions">General information on developing extensions for Mozilla applications</a></li>
+          <li><a href="/en/Extensions/Thunderbird/Finding_the_code_for_a_feature" title="en/Extensions/Thunderbird/Finding the code for a feature">Finding the code for a feature</a></li>
+          <li><a class="external" href="http://kb.mozillazine.org/Category:Thunderbird" title="http://kb.mozillazine.org/Category:Thunderbird">Mozillazine articles on Thunderbird</a></li>
+          <li><a href="/Special:Tags?tag=Thunderbird" title="https://developer.mozilla.org/Special:Tags?tag=Thunderbird">All pages tagged with Thunderbird</a></li>
+          <li><a href="/Special:Tags?tag=MailNews" title="https://developer.mozilla.org/Special:Tags?tag=MailNews">All pages tagged with MailNews</a></li>
+        </ul>
+      </td>
+      <td>
+        <h2 id="Community" name="Community">Community</h2>
+        <ul>
+          <li>See the list of all <a class="external" href="http://wiki.mozilla.org/Thunderbird/CommunicationChannels" title="http://wiki.mozilla.org/Thunderbird/CommunicationChannels">Thunderbird communication channels </a>first</li>
+          <li>Among these are:</li>
+        </ul>
+        <p>{{ DiscussionList("dev-extensions", "mozilla.dev.extensions") }}</p>
+        <ul>
+          <li><a class="link-irc" href="irc://moznet/#extdev">#extdev IRC channel</a> / <a class="link-irc" href="irc://moznet/#maildev">#maildev IRC channel</a></li>
+          <li><a class="external" href="http://forums.mozillazine.org/viewforum.php?f=19">MozillaZine forum</a></li>
+          <li><a class="external" href="http://mozdev.org/mailman/listinfo/project_owners">mozdev project owners</a></li>
+          <li><a href="/en/Extensions/Community" title="en/Extensions/Community">Other community links...</a></li>
+        </ul>
+        <h2 id="Tools" name="Tools">Tools</h2>
+        <ul>
+          <li><a class="link-https" href="https://addons.mozilla.org/en-US/firefox/addon/6622" rel="external nofollow" title="https://addons.mozilla.org/en-US/firefox/addon/6622">DOM Inspector</a> edit the live DOM (Firefox and Thunderbird)</li>
+          <li><a class="link-https" href="https://addons.mozilla.org/thunderbird/addon/workspace-for-thunderbird/" title="https://addons.mozilla.org/thunderbird/addon/workspace-for-thunderbird/">Workspace for Thunderbird</a>, allows running code snippets in Thunderbird and inspecting variable structure and content</li>
+          <li><a class="external" href="http://www.hacksrus.com/~ginda/venkman/" rel="external nofollow" title="http://www.hacksrus.com/~ginda/venkman/">Venkman</a>, a JavaScript debugger (<a class="external" href="http://addons.mozilla.org/en-US/firefox/addon/216" rel="external nofollow" title="http://addons.mozilla.org/en-US/firefox/addon/216">Firefox</a>, <a class="external" href="http://addons.mozilla.org/en-US/thunderbird/addon/216" rel="external nofollow" title="http://addons.mozilla.org/en-US/thunderbird/addon/216">Thunderbird</a>)</li>
+          <li><a class="link-https" href="https://addons.mozilla.org/en-US/firefox/addon/7434/" rel="external nofollow" 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="http://www.gijsk.com/" rel="external nofollow" title="http://www.gijsk.com/">Chrome List</a> view files in chrome:// (<a class="external" href="http://addons.mozilla.org/en-US/firefox/addon/4453" rel="external nofollow" title="http://addons.mozilla.org/en-US/firefox/addon/4453">Firefox</a>, <a class="external" href="http://addons.mozilla.org/en-US/thunderbird/addon/4453" rel="external nofollow" title="http://addons.mozilla.org/en-US/thunderbird/addon/4453">Thunderbird</a>)</li>
+          <li><a class="external" href="http://addons.mozilla.org/en-US/developers/tools/builder" rel="external nofollow" title="http://addons.mozilla.org/en-US/developers/tools/builder">Add-on Builder</a> a web-based extension skeleton generator (Firefox and Thunderbird)</li>
+          <li><a href="/en/Mozmill" title="en/Mozmill">Mozmill</a> test tool and framework</li>
+          <li><a class="external" href="http://xpcomviewer.mozdev.org/" rel="external nofollow" title="http://xpcomviewer.mozdev.org">XPCOMViewer</a> an XPCOM inspector (Firefox and Thunderbird)</li>
+        </ul>
+        <p>... <a class="internal" href="/en/Setting_up_extension_development_environment#Development_extensions" title="en/Setting up extension development environment#Development extensions">more tools</a> ...</p>
+        <p><span class="alllinks"><a href="/Special:Tags?tag=Extensions:Tools&amp;language=en" title="Special:Tags?tag=Extensions:Tools&amp;language=en">View All...</a></span></p>
+        <h2 id="Related_Topics" name="Related_Topics">Related Topics</h2>
+        <dl>
+          <dd>
+            <a href="/en/XUL" title="en/XUL">XUL</a>, <a href="/en/JavaScript" title="en/JavaScript">JavaScript</a>, <a href="/en/XPCOM" title="en/XPCOM">XPCOM</a>, <a href="/en/Themes" title="en/Themes">Themes</a>, <a href="/En/Developer_Guide" title="en/Developing_Mozilla">Developing Mozilla</a></dd>
+        </dl>
+      </td>
+    </tr>
+  </tbody>
+</table>
+<p><span class="comment">Categories</span></p>
+<p>{{ languages( { "ja": "ja/Extensions/Thunderbird" } ) }}</p>