When launching Mozilla, I get an error that prevents it from starting. The error is "Could not initialze the browser's security component. The most likely cause is problems with files in your browser's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full." I have no idea where the browser's profile directory lives, but if it's the directory where the application is or my ~/Library directory, it all has fine permissions that I can tell. The disk is not full. This error message does not help me fix the problem, unfortunately.
I have fixed this by deleting my Library directory. Mozilla starts up fine now.
... bug 105167 ... in the future, please select WorksForMe or Invalid for bugs where you resolve the problem w/o a code fix.