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.


Firefox Release

January 26, 2015

Version 35.0.1, first offered to Release channel users on January 26, 2015

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


  • Firefox Hello with new rooms-based conversations model

  • New search UI improved and enabled for more locales

  • Access the Firefox Marketplace from the Tools menu and optional toolbar button

  • Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs

  • Use tiled rendering on OS X

  • Improved high quality image resizing performance

  • Improved handling of dynamic styling changes to increase responsiveness


  • 35.0.1 - CSP had a change in behavior with regard to case sensitivity resources loading (1122445)

  • 35.0.1 - Fix a potential startup crash (1122367)

  • 35.0.1 - Kerberos authentication did not work with alias (1108971)

  • 35.0.1 - SVG / CSS animation had a regression causing rendering issues on websites like (1083079)

  • 35.0.1 - With a Right-to-left (RTL) version of Firefox, the text selection could be broken (1104036)

  • 35.0.1 - With the Enhanced Steam extension, Firefox could crash (1123732)

  • 35.0.1 - On Godaddy webmail, Firefox could crash (1113121)

  • 35.0.1 - document.baseURI did not get updated to document.location after base tag was removed from DOM for site with a CSP (1121857)

  • Show DOM Properties context menu item in inspector

  • Reduced resource usage for scaled images

  • PDF.js updated to version 1.0.907

  • Non-HTTP(S) XHR now returns correct status code

  • Various security fixes


  • Computed view: Nodes matching the hovered selector are now highlighted

  • Network Monitor: New request/response headers view (more info)

  • Added support for the EXT_blend_minmax WebGL extension

  • Support for inspecting ::before and ::after pseudo elements

Developer Information


  • Resource Timing API implemented

  • Changed JavaScript 'let' semantics to conform better to the ES6 specification

  • Added support for the CSS Font Loading API

  • CSS filters enabled by default


  • WebGL games might not display some textures (see bug 1113633)

  • Sometimes images don't display when hovered over (see bug 1083113)

  • Issues affecting RTL in Hello can be found here