Hi kumar1952, <br> you should start Firefox in [Troubleshoot Firefox issues using Safe Mode Safe Mode] to check if any of your Extensions (Firefox/Tools->Addons->Extensions) is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance). <br> * Do not click the Reset button on the Safe mode start window or otherwise make changes. * [[Troubleshoot Firefox issues using Safe Mode] * [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] Finally, you may need to Reset Firefox in order to fix your problem. Have a look at these articles on how to do this: * [[Reset Firefox – easily fix most problems]] * [[Reset Firefox preferences to troubleshoot and fix problems]] Hope that helped you! Please report back!

You can check for problems with the localstore.rdf file. *http://kb.mozillazine.org/Corrupt_localstore.rdf