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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.

36.0.3 Firefox Release

March 20, 2015

Version 36.0.3, first offered to Release channel users on March 20, 2015

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


  • Pinned tiles on the new tab page can be synced

  • Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.

  • Locale added: Uzbek (uz)


  • 36.0.3: Security fixes for issues disclosed at HP Zero Day Initiative's Pwn2Own contest

  • 36.0.1 - Hello may become inactive until restart (1137469)

  • 36.0.1 - Print preferences may not be preserved (1136855)

  • 36.0.1 - Hello contact tabs may not be visible (1137141)

  • 36.0.1 - Disable the usage of the ANY DNS query type (1093983)

  • 36.0.1 - Fixed a startup crash with EMET (1137050)

  • 36.0.1 - WebGL may use significant memory with Canvas2d (1137251)

  • 36.0.1 - Accept hostnames that include an underscore character ("_") (1136616)

  • 36.0.1 - Option -remote has been restored (1080319)

  • 36.0.1 - Fix a top crash

  • Various security fixes

  • CSS gradients work on premultiplied colors

  • Fix some unexpected logout from Facebook or Google after restart



Web Platform

  • Support for the ECMAScript 6 Symbol data type added

  • CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries

  • object-fit and object-position implemented.
    Defines how and where the content of a replaced element is displayed

  • isolation CSS property implemented.
    Create a new stacking context to isolate groups of boxes to control which blend together

  • CSS3 will-change property implemented.
    Hints the browser of elements that will be modified. The browser will
    perform some performance optimization for these

  • Improved ES6 generators for better performance

  • Changed JavaScript 'const' semantics to conform better to the ES6 specification.
    The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.


  • Style Editor: Extra white space appearing above the editor for a sourcemapped scss file (1128747)

  • For users who removed the Share & Hello buttons, this new version brings them back unexpectedly (1136300)

  • Firefox Hello does not work for link generators if there is no camera installed (1106941)

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