Initial crash report here: https://crash-stats.mozilla.com/report/index/bp-f51354bf-a4cb-4b98-8e65-6cd272130201

I think this crash is only happening on retina macbooks.

Crashes on my rMBP too, but at a different place: https://crash-stats.mozilla.com/report/index/bp-73481237-9021-4c4b-aa66-136b72130201 That makes me worry that this is heap corruption or something.

The original crash report is easily reproduced on a MacBook Pro Retina, Mid 2012, running 10.8.2. It happens immediately after clicking "Allow" in the full-screen permission request prompt. Here's another instance of the crash, which confused Breakpad mightily: https://crash-stats.mozilla.com/report/index/bp-cb3c6eb3-8d67-4437-af3a-b55162130201 Happily, Apple's crash reporter dialog extracted a bunch more details, which I'll paste. Given that there are 2^9 - 1 (511) frames on the stack, and the STACK GUARD stuff at the top, this sure looks like a stack overflow to me: Process: firefox [3266] Path: /Applications/FirefoxNightly.app/Contents/MacOS/firefox Identifier: org.mozilla.nightly Version: 21.0a1 (2113.1.31) Code Type: X86-64 (Native) Parent Process: ??? [1] User ID: 501 Date/Time: 2013-02-01 08:12:27.219 -0800 OS Version: Mac OS X 10.8.2 (12C3006) Report Version: 10 Sleep/Wake UUID: E21B1AFC-25B3-4C67-B4A8-616200630C27 Interval Since Last Report: 674370 sec Crashes Since Last Report: 1 Per-App Interval Since Last Report: 972 sec Per-App Crashes Since Last Report: 1 Anonymous UUID: C2ECDBEC-25BD-485D-AEDE-A6346F7FBB56 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_PROTECTION_FAILURE at 0x00007fff5f3fff30 VM Regions Near 0x7fff5f3fff30: __LINKEDIT 0000000201a1d000-0000000201a8a000 [ 436K] r--/rwx SM=COW /System/Library/Extensions/GeForceGLDriver.bundle/Contents/MacOS/GeForceGLDriver --> STACK GUARD 00007fff5bc00000-00007fff5f400000 [ 56.0M] ---/rwx SM=NUL stack guard for thread 0 Stack 00007fff5f400000-00007fff5fc00000 [ 8192K] rw-/rwx SM=COW thread 0 Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 XUL 0x000000010153cb24 nsStyleAnimation::ExtractComputedValue(nsCSSProperty, nsStyleContext*, nsStyleAnimation::Value&) + 20 1 XUL 0x00000001015415b5 nsStyleContext::GetVisitedDependentColor(nsCSSProperty) + 117 2 XUL 0x00000001013c9195

The "handleMouseMoved" repetition in the attached stack is the same as in bug 799523 comment 2. That bug is also about bananabread on OSX, so resolving as dupe.