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Firefox Release Notes

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

48.0 Firefox Release

August 2, 2016

Version 48.0, first offered to Release channel users on August 2, 2016

We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!


  • Process separation (e10s) is enabled for some of you. Like it? Let us know and we'll roll it out to more

  • Roar for moar protection against harmful downloads! We've got your back

  • Add-ons that have not been verified and signed by Mozilla will not load

  • GNU/Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast

  • Windows folks: Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode

  • Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know

  • WebRTC embetterments:

    • Delay-agnostic AEC enabled
    • Full duplex for GNU/Linux enabled
    • ICE Restart & Update is supported
    • Cloning of MediaStream and MediaStreamTrack is now supported
  • Windows 7 systems without Platform Update can now use D3D11 WARP

  • The media parser has been redeveloped using the Rust programming language


  • Improved step debugging on last line of functions

  • Heyo, Jabra & Logitech C920 webcam users. We fixed those pesky WebRTC bugs causing frequency distortions. Buh-bye, squeaky voice!

  • Various security fixes


  • Removed Firefox Hello

  • Au revoir to Windows Remote Access Service modem Autodial

  • After version 48, SSE2 CPU extensions are going to be required on Windows

  • Starting with the Firefox version 49 release, so long to support for 10.6, 10.7 and 10.8. Now we can focus on where most Mac users are: 10.9. Don't forget to upgrade!


  • Workers can now use the Web Crypto API

  • Expand network requests from the console panel to view request details in line, so you can see things in context

  • This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools

  • Add-on development just got easier because you can reload them from about:debugging — because we're all about debugging

  • Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure

  • Content Security Policy (CSP) is now enforced for WebExtensions. (Who's down with CSP?)

  • We're putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages

  • The memory tool now has a tree map view for your debugging pleasure. It's a little bit of "boo" and a whole lot of "ya"

  • Want to move absolute & fixed positioned elements? (Who doesn't, right?) Now you can with our geometry editor.

  • WebExtensions support is now considered as stable


  • On some websites using an important number of cookies, under certain conditions, this can cause the user to be logged out (1264192)

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