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Firefox Developer Edition
Firefox Developer Edition
91.0
3.8
0.0
HomeInternet UtilitiesBrowsersFirefox Developer Edition
Firefox Developer Edition free download for Mac

Firefox Developer Edition for Mac91.0

20 July 2021

Official Firefox release channel for experimental (beta) builds.

What is Firefox Developer Edition for Mac

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 Firefox Developer Edition

Version 91.0 (Beta 4):
New
  • Firefox now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS
  • Firefox now supports using logging into Microsoft, work and school sites using Windows SSO.
  • Locale added: Scots (sco)
  • The address bar now provides Switch to Tab results also in Private Browsing windows.
Fixed
  • The simplify page when printing feature is back! When printing, under More settings > Format select the Simplified option when available to get a clutter-free page.

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0.0
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There are no reviews yet
LeMerlot
LeMerlot
Aug 3 2018
62.0
5.0
Aug 3 2018
5.0
Version: 62.0
I use it daily.
Dendrite535
Dendrite535
Aug 3 2018
62.0
4.0
Aug 3 2018
4.0
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.
ggt667
ggt667
Sep 3 2016
50.0a2
5.0
Sep 3 2016
5.0
Version: 50.0a2
My all time favorite browser for developing home pages.
Big Johnson
Big Johnson
Jan 20 2016
45.0a2
0.0
Jan 20 2016
0.0
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.
kreiss
kreiss
Nov 6 2015
44.0a2
0.0
Nov 6 2015
0.0
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.
Eric•Woehler
Eric•Woehler
Sep 27 2015
43.0a2
2.0
Sep 27 2015
2.0
Version: 43.0a2
FF 42b1 is a dog with plugins - repeat visits asking to allow plugins even though have allowed in past. More than 5 tabs open? Very slow? Repeat visit? Repeated request to allow plugins. Noticeably slower than FF41. Have reverted to FF41 and will test future beta releases.
Wts
Wts
Mar 3 2015
38.0a2
1.0
Mar 3 2015
1.0
Version: 38.0a2
Why does Macintosh version always revert to using YAHOOOO as the internet search engine regardless of how many times i select GOOGLE ?

Oh, perhaps because development of FireFox is paid/sponsored by YAHOOOO.

Because of all the recent tweeking FireFox only deserves a one star rating.

Despite this serious flaw still use FireFox as my default browser.

What's with all this tweaking recently by Safari and FireFox?
ylluminate
ylluminate
Jan 21 2015
37.0a2
1.0
Jan 21 2015
1.0
Version: 37.0a2
This would be a 4.5 star review if Mozilla would get their act together and integrate native Cocoa text fields into the app. Many of us have been asking them to integrate this for spelling and other transformation, etc. purposes for over a decade with no effort. This is the only reason Firefox is not my default browser. Their dark theme on this dev release is killer. So much is going in the right direction on the Mozilla foundation projects, but they have to get this going in order to make Firefox, Thunderbird and the like worth even an ounce of attention from so many users and developers that I know.
Akanico
Akanico
Jan 21 2015
37.0a2
4.0
Jan 21 2015
4.0
Version: 37.0a2
Since I wrote a comment in 2013 wishing that Mozilla would add the ability to easily use another profile for beta and nightly releases, I had to salute them for doing so. Even though I found a way back then to choose what profile to use each time I'm launching any version of their browser, it's great they made it automatic on this one. Web developer tools are better to use than before and the black theme looks a bit outdated but is nice, though.
Wts
Wts
Jan 14 2015
36.0a2
1.0
Jan 14 2015
1.0
Version: 36.0a2
Hopefully FireFox gets better. I absolutely hate the last version with it's default to yahoooo search engine no matter how many times i've shut that selection off. At this point of time i give up on FireFox and have reluctantly switched to Safari . I strongly believe that FireFox is being funded by yahooo and the developers of FireFox are bending to the wishes of yahoo and are no longer an innovative completely independent browser developers. The developers of FireFox should issue their browsers Mac OS specific rather then, oh, this should work regardless which Mac OS you are using.
Palmharbor
Palmharbor
Nov 1 2014
34.0a2
0.5
Nov 1 2014
0.5
Version: 34.0a2
The requested URL /pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/firefox-34.0a2.en-US.mac.dmg was not found on this server. MY GOD…THEN TAKE THE DAMN THING OFF THE SITE!
Mt-Saint-Michel-+-Saint-Michaels-Mount
Feb 6 2014
5.0
Version: 28.0a2
Firefox Aurora 29a2 is out: ftp://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/ And I love the new UI Austrailis that comes with FF29. Can't wait for that build to become the stable release :) Good job Mozilla!
Akanico
Akanico
Nov 3 2013
27.0a2
4.0
Nov 3 2013
4.0
Version: 27.0a2
Would be great to be using alpha or beta releases the way we can actually do with google chrome products, which is with having a different profil running automatically. In other words, Aurora should be treated and executed as a different app as the firefox stable release installed with its own folder and its own profile. I think more people would go ahead and try these future releases that way.
Mikael-B
Mikael-B
Aug 1 2012
15.0a2
0.0
Aug 1 2012
0.0
Version: 15.0a2
Anyone know how to turn off the "update plugins" suggestion for a specific plugin? I'm partly on PPC and can't update Flash. When I develop on my PPC machine and test pages in Aurora I keep getting these reminders and have to click them every time before the flash plugin work, which is a nuisance.
MikkelFE
MikkelFE
May 11 2012
14.0a2
4.5
May 11 2012
4.5
Version: 14.0a2
better support for lion.. now with full screen support for Mac OS X Lion
alas!
alas!
Oct 1 2011
9.0a2
5.0
Oct 1 2011
5.0
Version: 9.0a2
FF 5 through 7 have been incredibly glitchy for me with v7 being a real bummer. Then, inexplicably, v7.0.1 turned things around for me being essentially issue free. I seem to be one of the only ones for whom 7.0.1 is a winner. At v7 I was about ready to give up on FF; I was bitching and moaning along with many others. Now, Aurora(really FF9) comes along and whaddya know, it's incredibly good;I am impressed. I'm finding it a bit faster than v7.0.1 and have yet to discover a bug therein. So far it's smooth saying all the way. I've got both v7 and 9(Aurora) in my dock and have been switching back and forth comparing the two and have to say that unless Aurora throws me a major curve, I'll likely stay with it. Of course, most of my ad-ons don't work in Aurora yet, but before long they should be compatible. At least Ghostery is working, I hate web bugs(trackers, behavioral data collectors and ad networks; In Ghostery I can block those miscreants). Yeah, Firefox is real sweet once again; everthing's copasetic at this point. I may even forgive Mozilla for its wham, bam, thank you mam approach to turning out versions, although I still can't grok Mozilla's rationale for turning out versions so frequently. What's the hurry??? So what if Google is spitting out Chrome versions like crazy?…"Oh God, Chrome's at version 15 already, gotta get humpin' ". Firefox is a much more competent and elegantly designed browser, now isn't it?
Steven-Goodheart
Steven-Goodheart
Sep 17 2011
8.0a2
4.0
Sep 17 2011
4.0
Version: 8.0a2
Firefox 7.0 has become such a "crasher" for me, every 5 to 10 minutes, I thought, "What the hell, could Aurora be any worse?" So far I'm not getting the regular crashes I was getting with 7.0 (b5) -- recurring crashes that happened even with all add-ons disabled. Guess I'll see soon enough if this going to be better...got so bad, I started using Chrome -- a huge memory hog, but at least it doesn't crash every 10 minutes.
Mac007
Mac007
May 17 2011
5.0a2
3.5
May 17 2011
3.5
Version: 5.0a2
For beta software this is not bad. It does have problems with Facebook Flash based games but overall it works fairly well. I still have to use it more to get a better feel for it's good and bad aspects but for now I have a very favorable view.
Free
3.8
0.0
App requirements: 
  • Intel 64
  • macOS 10.12.0 or later
License: 
FreeAbsolutely Free

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