User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9pre) Gecko/2008042504 Minefield/3.0pre Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9pre) Gecko/2008042504 Minefield/3.0pre This is a horrible, horrible bug report, but I don't quite know what details are relevant or how to find them. I use Firefox every day on Windows without a problem. When I started switching to the Mac, I found that several times a day, visiting the exact same sites would eventually wedge Firefox in a rather strange way: 1. A page would occasionally display with some or all of its content unstyled by CSS. This was usually my clue that Firefox had become semi-wedged. Reloading the page would usually display the fully-styled page. 2. Sometimes, after #1, menu items would cease responding. The menu bar itself would appear to work, but selecting menu items (e.g. Tools -> Add-ons) would have no effect. 3. Once #1 or #2 happened, Firefox would be unable to quit. It would respond to Command-Q, and close the browser window, but the app would never quit; it would require force-quitting. I've never seen any messages in system.log that seemed relevant. I switched to Firefox 3.0b5 a few weeks ago, and the problem didn't recur, so I assumed that the rewrite of Gecko had fixed the problem. However, on 4/25, I switched to 4/24's nightly build, and ran into the problem within a few hours! I'm now using the 4/25 build, and haven't recreated it yet. Reproducible: Sometimes Steps to Reproduce: I've spent many hours trying to find a fail case with no luck. I can report that visiting the same page that caused the "wedge" does NOT reproduce the problem by itself. I'm happy to turn on logging, build Firefox myself with something enabled, whatever; I just don't know where to start looking. It's a very vague problem, but I know it when I see it... I haven't found any dupes in bugzilla, but everyone I know with a Mac seems to run into it once in a while. This happens on two machines: 1. MacBook Pro, 2.4GHz, 4GB RAM, Leopard 10.5.1 (now 10.5.2) 2. Mac Pro, 8-core 3.2GHz, 16GB RAM, Leopard 10.5.2 It happened repeatedly with Firefox 2 (2.0.0.11 or 12 at the time, I believe) on the MacBook. It happened once with Firefox 3, nightly 2008-04-24.

FWIW, this happened again on a post-RC1 build (Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9pre) Gecko/2008052104 Minefield/3.0pre). The only commonality I've noticed is that I often see it on washingtonpost.com. On the other hand, I visit that a lot, so it could be coincidence.

I've had the same issue on Mac OS X 10.5 for quite some time now, another thing is that it also has started occuring on windows here and there. Fairly disturbing issue.

I've got exactly the same problem, since I've started working on Macs. Every couple times a day, when I'm in the lab, working on my Mac. 100% reproducible on two websites I visit constantly during the day, and on two machines I've been working on/I'm working atm: eMac G4, and MacPro QuadCore 2.8GHz, 8GB. Firefox versions, on which the problem occurs: every version since 2.0.x till 3.0.x. Huh, this is really annoying.

Oh, in the case of 2nd Mac, Leopard 10.5.3 is installed. The other, older Mac has Tiger 10.4.14 or smth like that.

This is happening with (what seems to be) increasing frequency; it happened to me twice yesterday, under OS X 10.5.4. Sometimes I can quit after the unstyled-content page; sometimes I have to force-quit, as Firefox appears to be responding but doesn't actually quit when told to. There's no apparent pattern as to which page it happens on, how much browsing I have to do, or how long the app's been open. I will do anything at all to troubleshoot, up to and including keeping a wireshark/tcpdumpcap trace of my entire daily web experience... can any dev/QA types give at least a hint as to where I could start looking?

This happens to me too, only it usually results in entire sites not loading ala bug 443632. Only some of the time it manifests itself as css not loading. The menu bar fails to heed any of the actions selected, but Firefox can be quit by right clicking on its icon in the dock. Does not require a force-quit.

Lately, I've noticed that whatever happens to make the page "CSS-less" survives a quit/restart. Would looking at the cached page shed any light on this?

FF 3.0.2 is out. anyone ready to test it? :) good luck ! :)

This doesn't seem to happen with 3.1 or trunk nightlies... so far...

sorry mate, 3.1 beta 2 has exactly the same problem. I dare to say - it's even worst - I got it after like 15mins of working on it....

After a few weeks of monkeying around, I have noticed the following: Running firefox 3.0.6 with no extensions, this problem occurs several times a day. Running firefox with the extension "Flash Block" enabled causes the problem to occur several times an hour. And finally, I have not had the problem occur at all since disabling the Adobe Flash plug-in a week ago. comp: core2duo intel macbook w/OS X 10.5.6

ok. after uninstalling Flash Block plugin, and working for the past 2 weeks almost, I didn't get ANY troubles. it all works just fine now..... nice work farrisry@msu.edu :)

Firefox 3.0.7, OS X 10.4.11, Flash plugin 9.0 r151. Core2Duo MBpro. No extensions; will try disabling Flash altogether. I've been seeing this bug for years. I can't replicate perfectly, but I can decrease the frequency of occurrence by hosing my system into the ground so it's paging like crazy. Smells like a concurrency problem to me. Good luck on that. :-P

I'm getting issues like what the first reporter described all the time lately. Running FF 3.5.3 on OS X 10.6.1. The only add-on I had was DownloadHelper, but it doesn't seem to have changed anything to disable it. Driving me absolutely batty. Also, when I come back to computer after 15+ minutes away, internet connection is gone. Airport is on, icon shows strong connection to my wireless, but I can't load anything. If I turn Airport off then on again, it seems to reset, most of the time. Also getting issues with FF hanging when I try to attach files to Gmail messages, save/print a web page as PDF, etc. I'll pay better attention next time to the "script stopped running" message that appears on the print-to-PDF crashes.

do you still see the "quit" problem when using FF 3.6? regarding CSS [from Bug 532845] - css styling issues can happen if your network (ISP, wireless router, etc) or PC doesn't supply css info fast enough. this can easily happen when loading lots of pages at the same time (like during session restore, see bug 475603) which can overload your network. does this sound like possible cause of your problem? xref Bug 419526

FYI, I've had these problems too in the past, but IIRC, I haven't seen such problems for several months (probably since FF 3.6). CSS are not always loaded, but this is quite rare and may come from overload or a temporary problem with the server (IMHO, FF should signal an error in some form).

(In reply to comment #16) > ... may come from overload or a temporary problem with the server yes, slow server can also cause it - recently seen on bugzilla.mozilla.org and socorro on crash-stats.mozilla.org

Reporter, can you still reproduce this bug in Firefox 10.0.2? Please update to Firefox 10.0.2 or later, update your plugins, and retest in a new profile. If you still see the issue with the updated version of Firefox, please post here. Otherwise, please close as RESOLVED > WORKSFORME. http://getfirefox.com/ http://support.mozilla.com/kb/Managing+profiles

I'm no longer using Firefox regularly; if :wsmwk isn't seeing it anymore either, please close.

I still get to see it. However, I don't have additional information than what's in the bug.

Is this bug still reproducible in the latest version of Firefox? https://www.mozilla.org/de/firefox/new/

I no longer see it often, but I'm not on Mac. When I was seeing it often, many times I was no a slow network. I read in the last couple days a bug comment which hinted this can be expected on slow networks.