<p>Develop, deploy and debug Firefox OS apps directly in your browser, or on a Firefox OS device, with this tool that replaces App Manager.</p><ahref="https://developer.mozilla.org/docs/Tools/WebIDE"rel="external"class="more">Learn more about WebIDE</a></li>
<p>Develop and debug your apps across multiple browsers and devices with this powerful extension that comes pre-installed with Firefox Developer Edition.</p><ahref="https://developer.mozilla.org/docs/Tools/Firefox_Tools_Adapter"rel="external"class="more">Learn more about Valence</a></li>
</ul>
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<h4>Important: Sync your new profile</h4>
<p> Developer Edition comes with a new profile so you can run it alongside other versions of Firefox. To access your bookmarks, browsing history and more, you need to sync the profile with your existing Firefox Account, or create a new one. <ahref="https://support.mozilla.org/kb/recover-lost-bookmarks-firefox-developer-edition"rel="external"class="more">Learn more</a></p>