See what’s new in Firefox!

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.

53.0beta

Firefox Beta

March 7, 2017

Version 53.0beta, first offered to Beta channel users on March 7, 2017

New

  • Improved graphics stability for Windows users with the addition of compositor process separation (Quantum Compositor)

  • Two new 'compact' themes available in Firefox, dark and light, based on the Firefox Developer Edition theme

  • Lightweight themes are now applied in private browsing windows

  • Reader Mode now displays estimated reading time for the page

  • Windows 7+ users on 64-bit OS can select 32-bit or 64-bit versions in the stub installer

Changed

  • Updated the design of site permission requests to make them harder to miss and easier to understand

  • Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates on Firefox ESR 52.

  • 32-bit Mac OS X is no longer supported. 32-bit Mac OS X users can switch to Firefox ESR 52 to continue receiving security updates.

  • Updates for Mac OS X are smaller in size compared to updates for Firefox 52

  • Media playback on new tabs is blocked until the tab is visible

  • Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron

  • New visual design for audio and video controls

  • The last few characters of shortened tab titles fade out instead of being replaced by ellipses to keep more of the title visible

  • Media playback on new tabs is blocked until the tab is visible

Developer

  • Support for WebM video with alpha, which allows playing videos with transparent backgrounds

  • Changes for web developers

Developer Information