Comment 2 for bug 543440

i had this problem , i started in safe-mode and chose to disable addons . this made it start ok.
i then closed it and restarted normally and it worked ok.

it then failed again and i did the same but checked the addon list and found that the web developer toolbar and split panel addons that i'm using where flag as not compatible , i disabled them and restarted and it all seems fine again.

maybe a bug in the handing of incompatible addons ?