Firefox Beta and Developer Edition
Release Notes

Support for Windows 10

Added protection against unwanted software downloads

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

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

Add-on extensions that are not signed by Mozilla will display a warning

NPAPI Plug-in performance improved via asynchronous initialization

Smoother animation and scrolling with hardware vsync (Windows only)

JPEG images use less memory when scaled and can be painted faster

Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data

Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view

New rules view tooltip in the Inspector to tweak CSS Filter values

New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page

Console API messages from SharedWorker and ServiceWorker are now displayed in web console

Inspector now searches across all content frames in a page

IndexedDB transactions are now non-durable by default

Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for
musical intervals

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