Trusteer Rapport has been associated with some problems, if you use that software ensure it is updated. '''Do any of these help''' # using safe mode <br /> see [[Troubleshoot Firefox issues using Safe Mode]] # running in safe mode AND disabling any plugins # using a clean profile <br /> see http://kb.mozillazine.org/Profile_Manager#Creating_a_new_profile <u>Thinking about what is''' not '''likely to be the problem</u><br /> Often security related software may block Firefox after an upgrade, that may then work on again on downgrading (Downgrading though is not recommended as it is a security risk). The fact that Firefox opens first before hanging probably rules out problems with * security software *sessionstore A normal reinstall of Firefox rarely solves problems.