Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox. * http://kb.mozillazine.org/Profile_folder_-_Firefox * http://kb.mozillazine.org/Profile_backup

Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. *Shockwave Flash 10.0 r45 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)