Have tried everything. Uninstalled firefox and deleted all profiles from everywhere ( roaming and local in Appdata) 
Disabled add ons , started in safe mode , with new profile.

No other browser has problem. IceDragon also no problem and works fine.Neither  the Chrome type browsers have any problem.

Thank in  advance.

Firefox keeps freezing at start up. Unfreezes after 5-6 minutes works for a while and then does the same till total crash. Have tried everything. Uninstalled firefox and deleted all profiles from everywhere ( roaming and local in Appdata) Disabled add ons , started in safe mode , with new profile. Windows 7 64 ultimate, fully updated, Adobe also fully updated, all fully updated. Though I have noticed it does not recognize the Adobe flash 16 and says Adobe flash15 as an add on. Nowhere the adobe 15 exists though since it's entries also erased from the registry as well. GHistory and cookies where cleaned multiple times. Checked for malaware but everything is clean. Started PC in safe mode and again the same crashing problem with firefox. No other browser has problem. IceDragon also no problem and works fine.Neither the Chrome type browsers have any problem. any help excluding to eraze my Windows and reinstall all the programs again. Not possible to take this risk for just a browser. Thank in advance.