Sorry is Version 41.0.2

Product Firefox Version 41.0.1

Release Channel release OS Mac OS X OS Version 10.11.0 15A284

For some time now, a lot of Mac’s with Microsoft programs have been crashing. Check with Microsoft / Mac support sites.

Sorry i marked FredMcD's answer erroneously as "helped me" but absolutely not!

Maybe you didn't read the problem carefully enough. If i woiuld suffer any MICROSOFT problems i would contact Microsoft.

I do not have any problems with Microsoft products nor do they run while FIREFOX is running. But Firefox is crashing a lot like a lot of other users report, too. So would be thankful for any help regarding this FIREFOX issue and no Microsfot help.

Sorry FredMcD's answer didn't help anything.

FredMcD said

Product Firefox Version 41.0.1 Release Channel release OS Mac OS X OS Version 10.11.0 15A284

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For some time now, a lot of Mac’s with Microsoft programs have been crashing. Check with Microsoft / Mac support sites.

The crash report flagged these programs;

libobjc.A.dylib =  ? Word for Mac

libsystem_kernel.dylib =  ? Word for Mac

libdispatch.dylib =  ? Word for Mac

libsystem_pthread.dylib =  ? Word for Mac

lpxpcom_x86_64.dylib = unknown  ? LastPass

It's not my problem, what FireFox marks. Word is not running and if FireFox causes problems with Word, than FireFox has obviously a problem as it should not interact with (a closed) Word anyway! Guess FireFox is not a part of Microsoft's Office suite, yet... Maybe developers should search for a reason why FireFox interacts with closed programs and crashes on this interactions in El Capitan.

You can try to disable hardware acceleration in Firefox.

• Firefox > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

You can check for corrupted and duplicate fonts and other font issues:

• http://www.thexlab.com/faqs/multipleappsquit.html - Font Book 2.0 Help: Checking for damaged fonts
• http://www.creativetechs.com/iq/garbled_fonts_troubleshooting_guide.html

The problem still occurs in Safe Mode >If your problem persists in Safe Mode, it is not being caused by an >extension, theme or hardware acceleration.

There are no duplicated fonts or missing font elements in Font book

Can you set a different default font on your Mac that Firefox uses for the user interface?

font related issue.
*https://crash-stats.mozilla.com/report/index/534552c9-0fdb-4f05-9b49-55beb2151024
5 	XUL 	gfxMacPlatformFontList::GetDefaultFont(gfxFontStyle const*)
6 	XUL 	gfxFontGroup::GetDefaultFont()
7 	XUL 	nsFontMetrics::ExternalLeading()

As system font of El Capitan is so horrible, i guess a lot of people - specially in graphic design - replaced the system font with this alternatve: https://github.com/jenskutilek/FiraSystemFontReplacement

But is is still FireFox's secret why it is the only program which crashes with this new system font? So i would still call this a bug. But thanx a lot for your enduring survey of the crash repport! And i think this could be the basic reason of all crashes... i will check that. Best.

So, you have confirmed that the crashes are caused by replacing this system font with another font and you no longer have crashes when you reverse this change?

Sorry, no. I have to checked it for the last few days now, but crash came back dispite i replaced the original systemfonts.

As linked in the begining of this thread, it mostly crashes after sleeping mode or while trying to open a new tab or window.

Tanks for your help

OH NO... it crashed again... bp-4f11d31f-4f5a-478c-b320-8116f2151026

Signature libobjc.A.dylib

lpxpcom_x86_64.dylib = LastPass ?

libsystem_kernel.dylib =  ? Word for Mac

libsystem_pthread.dylib =  ? Word for Mac

libdispatch.dylib =  ? Word for Mac

libobjc.A.dylib =  ? Word for Mac

As a test, disable LastPass

I can check it again, but i checked it so much with all Plugins deactivated and in SafeMode and FireFox crashed, too....

Last Past is the most important plugin at all. Without it, i would have to change the browser instantly, as it is the basis for all internet access...

No keeps crashing, so none of your suggestions did actually change anything. In the end the fonts did not cause these troubles, too...

I marked cor-el's answer as a Solution, but after a few days i have to admit that it was not the solution. Firefox keeps crashing, still...

hirschferkel said

Since Update to 42 it keeps crashing 5-10 times a day. Seems like the same mentioned here: https://discussions.apple.com/thread/7269348 Meldungs-ID Sendedatum bp-534552c9-0fdb-4f05-9b49-55beb2151024 24.10.15 13:01 bp-53541f78-3d03-414f-80e9-9fa6e2151024 24.10.15 13:01 bp-490702e2-ea63-4e5b-bd95-0a7cc2151024 24.10.15 13:01 bp-f93b3c6f-756c-49ca-b0cf-940752151024 24.10.15 13:00 bp-fec291be-2225-4720-a4fc-68fe52151024 24.10.15 13:00 bp-d27af96c-a3cb-43c3-abcb-7ae272151024 24.10.15 13:00 bp-de878a2f-b6d5-4ce8-86b1-7eab32151024 24.10.15 13:00 bp-4fa8f9fd-3981-4e71-80e5-37e732151024 24.10.15 12:28 bp-b404e677-d9e1-452f-8f4f-d52ce2151023 23.10.15 20:14 bp-7a91ac84-14f7-40fe-b4c2-733302151023 23.10.15 19:54 bp-447b2055-4098-4260-b846-f65c52151023

FireFox was my browser of choice. However, it is now so slow and unreliable that I, unfortunately, have to switch to Safari, which is at least reliable.

Eddyc4491, if you need help, Please go to the top of any support.mozilla.org web page and use the Ask A Question link; https://support.mozilla.org/en-US/questions/new This will let us look at your system details. No Personal Information Is Collected.