A change from r142707 to the newest r142736 has caused it to crash before loading the first page. Please check.
Created attachment 188082 [details] Crash Report for webkit
I tried it will all plugins turned off, made no difference.
*** Bug 109705 has been marked as a duplicate of this bug. ***
*** Bug 109696 has been marked as a duplicate of this bug. ***
Created attachment 188117 [details] crash report as text
Fixing through rollout as bug 109716. *** This bug has been marked as a duplicate of bug 109716 ***
*** Bug 109717 has been marked as a duplicate of this bug. ***
*** Bug 109732 has been marked as a duplicate of this bug. ***
Created attachment 188362 [details] This a file containing the last four crash reports.
Created attachment 188717 [details] Crash report for build r143098
The crash on open appears to be fixed for me now. I believe crash report '2013-02-16 10:10 PST' belongs in bug 109838.