Firefox Developer EditionBeta for Mac
Official Firefox release channel for experimental builds.
Free
In English
Version 147.0When you purchase through links on our site, we may earn an affiliate commission
Firefox Developer Edition overview
Firefox Developer Edition (was Aurora) is the rapid-fire release channel for the next iteration of the Firefox Web browser. The Developer channel is where users can test the latest features and innovations. Users can expect an increase in polish from the raw, cutting edge features in the nightly builds. These releases may not be as stable as beta or final releases.
With Firefox Developer Edition:
- Experience the newest innovations in an unstable environment that's not for the faint of heart
- Provide feedback on features and performance to help determine what makes the final release
What’s new in version 147.0
New
- WebGPU support is now enabled for all macOS versions on devices with Apple Silicon processors.
- Zero copy video of hardware decoded video with AMD GPUs if supported, improving video playback performance on those
- systems.
- Firefox now supports the Freedesktop.org XDG Base Directory Specification.
- Firefox now supports the Safe Browsing V5 protocol and is migrating from Safe Browsing V4 to the local list mode of Safe
- Browsing V5 protocol.
- We've added a new feature to automatically open a Picture-in-Picture player window for a playing video in a tab if that
- tab is ever backgrounded. This feature was mainly contributed by a volunteer Daniele Ferla, and has recently graduated
- from Firefox Labs! You can turn this feature on by visiting about:settings and checking "Keep playing videos in
- Picture-in-Picture when switching tabs".
- Firefox 147 includes support for Compression Dictionaries, IETF RFC 9842. This can significantly reduce the number of
- bytes transferred to load a page in several ways. That can lead to faster pageloads, especially for users with
Fixed
- A draggable button is now draggable if the drag is started from the button itself.
- Fixed an issue that prevented Windows users from selecting a tab when the cursor was at the top of the screen and Firefox was maximized on some kinds of monitors.
- For Linux GNOME Mutter users, window and rendering surface sizes were updated to match the actual pixel grid so Firefox delivers sharp rendering on fractionally scaled displays regardless of actual window size.
- Fixed a bug that made HTTP/3 requests containing non-UTF-8 header values time out or fallback to HTTP/2 after awhile.
Changed
- Firefox now uses the same quality values (q-values) in Accept-Language headers as other major browsers. The second language preference is now sent with q=0.9 instead of q=0.5, with subsequent languages decreasing by 0.1 each (minimum 0.1). This change fixes compatibility issues with some servers that incorrectly rejected requests with lower quality values.
Firefox Developer EditionBeta for Mac
Free
In English
Version 147.0
Write a detailed review about Firefox Developer Edition
(18 Reviews of Firefox Developer Edition)
Comments
User Ratings
Aug 3 2018
Version: 62.0
I think MacUpdates is very late off the blocks for this one. V. 62.0 came out about two weeks ago, now its up to 62.0.B13 The browser in its current edition has a few faults in rendering pages, but its not bad. There seems to be no way to offer feedback.
Sep 3 2016
Version: 50.0a2
My all time favorite browser for developing home pages.
Jan 21 2016
Version: 45.0a2
"Provide feedback on features and performance to help determine what makes the final release"
Oooh, you mean like putting the tabs on top despite complaints from scores of users and refusing to provide a setting to change it because those users are just wrong?
Obviously users' opinions are of no concern to the development team.
Nov 6 2015
Version: 44.0a2
I don't recommend this. Firefox is supposed to be free and open, and independent. The latest version from Mozilla, for Mac, is 42.0.
But Version 44.0a2 (which I downloaded from Macupdate) is something quite different. My Sophos antivirus detected a PUA (potentially unwanted application) associated with it, and this could very well be that automatic Yahoo link, making Yahoo the default browser.. This is sneaky and unpleasant. Avoid Version 44.0a2.
42.0 which I downloaded direct from the Mozilla website, is fine.
