Getting a startup crash, happens with 3.0-r1, 3.0, and I believe the last RC as well. I got this a week or so ago, but had trouble reproducing it. But now it happens every time I restart. Tried moving ~/.mozilla/ and all plugins out of the way, but no help. Re-emerged with splitdebug; will attach backtrace... apparently you can't paste into forms with links :-P
Created attachment 158061 [details] gdb backtrace
Created attachment 158063 [details] emerge --info
Sorry, don't know how I missed bug 228957 on my first search. *** This bug has been marked as a duplicate of bug 228957 ***