Firefox Developer Edition
March 10, 2017
Version 54.0a2, first offered to Firefox Developer Edition channel users on March 10, 2017
For more information about Developer Edition please see this MDN article.
Bookmarks created on mobile devices are now shown "Mobile Bookmarks” folder in the drop down list from the toolbar and Bookmarks option in the menu bar in Desktop Firefox
Media in a new opened background tab won’t be autoplayed
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