run a clean upgrade of Firefox 8, remove Firefox 7 fully before remove then try * getfirefox.com

There may be a problem with the file profiles.ini * http://kb.mozillazine.org/profiles.ini_file See also Profile Manager *http://kb.mozillazine.org/Profile_Manager *https://support.mozilla.com/kb/Managing+profiles Create a new profile as a test to check if your current profile is causing the problems. See "Basic Troubleshooting: Make a new profile": *https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems. If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files. See: *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox ---- There are other things that need your attention. Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. # Shockwave Flash 10.1 r53 # Next Generation Java Plug-in 1.6.0_15 for Mozilla browsers Update the Flash plugin to the latest version. *https://support.mozilla.com/kb/Managing+the+Flash+plugin *http://kb.mozillazine.org/Flash *http://www.adobe.com/software/flash/about/ Update the Java plugin to the latest version. *https://support.mozilla.com/kb/Using+the+Java+plugin+with+Firefox *http://kb.mozillazine.org/Java *http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)