Mozilla Firefox

Works fine in 10.8

Works fine in 10.7

Mozilla Firefox

Supports iCloud

Secured by Gatekeeper

Supports retina graphics

Mozilla Firefox icon

Available on the Mac App Store
Not available on the Mac App Store

Firefox is a web browser that empowers you to accomplish your online activities faster, more safely, and efficiently than any other browser, period. Built with Tab browsing, popup blocking, and a number of other seamless innovations, Firefox stands out ahead.

Version 11.0
Developer Mozilla
Status Works fine

0 ratings

Lion's full screen still not supported

Archived comments

No comments.24 comments

Lion (10.7) Comments

[ ]capz 08 Mar 2011 23:01

4.0b12 Works fine, haven't tried 3.5
note: change the icon display mode to icon only to have it change to an ipad-style toolbar!

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[ Macterryh]MacterryhAnonymous 09 Apr 2011 15:45

FF 4.0 Final, Works Fine.

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[ Steve]SteveAnonymous 19 Jun 2011 12:35

Keeps crashing on startup with Firefox 5 final

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[ Steve]SteveAnonymous 19 Jun 2011 14:20

I´m so sorry to have provided inacurate information. I meant the latest beta of FF 5.

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[ Rolandius]RolandiusRolandius 20 Jun 2011 02:55

Just to straighten everything out, 4.0.1 is the latest stable version of Firefox currently.

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[ ]Anonymous 23 Jun 2011 06:49

5.0 crashes extremely often under Lion.

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[ Jamie]JamieAnonymous 24 Jun 2011 03:32

Firefox 5 and the previous Firefox 4 version crash extremely often on the latest Lion Beta

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[ Squuiid]SquuiidAnonymous 03 Jul 2011 18:31

5.0 crashes, a LOT.

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[ MarkByrn]MarkByrnAnonymous 07 Jul 2011 05:10

Pretty much useless on Lion - crashes often and hard

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[ Ted E]Ted EAnonymous 07 Jul 2011 18:02

Firefox 5 is completely useless on Lion GM. The more it is open it seems, the more it crashes.

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[ Hansi]HansiAnonymous 07 Jul 2011 18:39

Firefox 5 works fine an don't crash on my MacBook Pro

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[ Bill]Billkernelguy 07 Jul 2011 20:11

Absolutely ZERO issues with FF5. Those having problems should check for incompatible plugins.

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[ ira42]ira42Anonymous 12 Jul 2011 23:24

The Firefox team have acknowledged a known issue with FF 5.0 and Lion, regarding sites which use rendered fonts (e.g.: Typekit font rendering).

I've encountered this issue every few minutes with both FF 5.0 and 5.0.1 on Lion, rendering it unusable for me.

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[ gopher]gophergopher 16 Jul 2011 19:24

Version 3.0.14 works with 11a494a.

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[ CS]CSAnonymous 21 Jul 2011 15:56

Firefox 5.0.1 seems to work fine in Lion with one noted (and annoying) exception. The two finger swipe gesture to navigate through web pages no longer works. I suspect Firefox needs to be updated with the new commands for Lion. Hope this happens soon…

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fritzboylefritzboyleAnonymous 21 Jul 2011 21:59

firefox 5.0.1 on lion was rendering incorrectly, using 95% + of the cpu and crashing/not responding.

I cleared all personal data (cache, etc) and also ran in safe mode, this helped, but was not very usable (still very slow). I restarted (not in safe mode) and still had the slow downs and high memory usage. the app still does not run smoothly and many pages are not rendering images (gif & jpg) very well (stuttering, broken links)

the plug ins and add ons may or may not be the issue, but since I still had problems in safe mode, I am thinking it is not likely.

at this point, I am using chrome as my browser as it seems to run just fine on lion.

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[ mw4rf]mw4rfAnonymous 22 Jul 2011 09:14

1) People upgrading from Snow Leopard to Lion should expect crashes and other issues. If you want to avoid that, do a clean install instead of upgrading. On a clean Lion system, Firefox 5, 6 (beta) and 7 (aurora) run fine.

2) As for the compatibility, well… it works, but it's not really compatible, because it doesn't use the latest Apple technologies : fullscreen mode (on a new virtual desktop, and with the menu bar hiding like Safari), save current state on close and restore on launch, 2-fingers gesture to go back and forward… In sum, it's "barely" compatible.

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[ DesiStX]DesiStXAnonymous 22 Jul 2011 10:47

v.5.0.1 seems stable and works fine.

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ChrisChrisAnonymous 23 Jul 2011 06:40

Had to reinstall Firefox 5.0.1 after I upgraded to Lion. Would not display Facebook and other sites initially after upgrading. If you are having problems, simply reinstall Firefox 5.0.1

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gengenAnonymous 27 Jul 2011 05:38

Lion compatibility is still in process:

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[]craigcurtis@me.comAnonymous 16 Aug 2011 13:19

[Version 6] won't launch (says it is already open and can only launch one version at a time)

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[ Matt]MattAnonymous 31 Aug 2011 23:11

Firefox v6 crashes almost constantly, as well having an incredibly bogged down internet connection.

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[ Jim]JimAnonymous 05 Sep 2011 22:28

Firefox 6 confused some networking issues. Its timing couldn't have been worse as it came out about the same time as 10.7.1. As it turns out the networking problems are Lion's (pages of discussion on Apple's forums). I did not stay on Lion long enough to evaluate Firefox because of the Lion's other issues.

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TGBTGBAnonymous 26 Oct 2011 06:59

Full Screen support is a feature, not a "problem". There is currently a distinct lack of anything here which says Firefox has any particular issues, aside from vague user error and coincidences with Apple patches coming out.

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