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Firefox Beta and Developer Edition
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.

40.0beta Firefox Beta

July 3, 2015

Version 40.0beta, first offered to Beta channel users on July 3, 2015

New

  • Support for Windows 10

  • User can receive suggested tiles in the new tab page based on categories Firefox matches to browsing history (en-US only).

  • Hello allows adding a link to conversations to provide context on what the conversation will be about

  • New style for add-on manager based on the in-content preferences style

  • Improved scrolling, graphics, and video playback performance with off main thread compositing (GNU/Linux only)

  • Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked

Fixed

  • Kannada text does not display properly in built-in pdf viewer

Changed

Developer

Web Platform

Unresolved

  • If Firefox is restarted from an add-on install notification, on-going private browsing downloads might be canceled without warning (1185294)

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