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---- There are other things that need attention: Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.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_16 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)