Do you have that problem when running in the Firefox SafeMode? <br /> [http://support.mozilla.com/en-US/kb/Safe+Mode] <br /> ''Don't select anything right now, just use "Continue in SafeMode."'' If not, see this: <br /> [http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

This can be a problem with the file places.sqlite that stores the bookmarks and the history. * http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox ---- There are other things that need attention: Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. *Next Generation Java Plug-in 1.6.0_17 for Mozilla browsers Update the [[Java]] plugin to the latest version. *http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)