last two crash IDs: ID: bp-2914b1d5-60bd-47b7-b47f-764cd2151003 ID: bp-83fe82c9-2b4b-4276-b16f-b5b9c2151003

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

I did stop hardware acceleration already. also for flash. All my Mac software is up to date. Have been checking for new software once an hour for the last few days.... Fonts seem ok. Some duplicates but resolved automatically. .....

It still seems to be related to fonts as this call shows in the crashing thread:

• gfxMacPlatformFontList::GetDefaultFont(gfxFontStyle const*)

Maybe try to set a different default font in the Mac settings if there is a place to specify this default font.

Have changed the default font in Firefox. There is no place that i can find to set a default Mac font. Used Fontbook to check all fonts. Deleted a number of them that showed up with problems. Finally reset/reinstalled the system fonts. Firefox still crashes.

Please post new crash reports.

last two IDs: bp-74f52531-a692-493f-9639-9fc402151011 11.10.15 21.28 bp-8e733033-da49-4318-9580-719cf2151011 11.10.15 21.05

...and this one from just now. bp-3cb00be8-86bc-439f-ad6e-f8eea2151012

I can say only one thing: it almost always seems to happen when i switch back to Firefox from another app. Rarely also right when i hit a site. If this helps...

libsystem_pthread.dylib =  ? Word for Mac

libsystem_kernel.dylib =  ? Word for Mac

libobjc.A.dylib =  ? Word for Mac http://support.microsoft.com/kb/2693802/en-us

libdispatch.dylib =  ? Word for Mac

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

Hmmm. No Microsoft SW here. Not true: Skype. But i checked and yep, there are old prefs files. All deleted. Will report back.

Deleted prefs files, anything in my computer that said 'microsoft', restarted, still crashing.... bp-0931a98b-f799-4dd1-8399-8dabe2151012

This report is the same as the others. I've called the big guys to help you. Good luck.

ID: 31a5b194-0c81-4344-9235-30d812151013

...........

ID: 9f3c3a1f-f720-43ba-b0f6-45f7b2151020

big guys? any ideas? i hate every other browser, but Firefox is coming to be seen by me as unusable.