Your Firefox settings and info are kept in a folder separate from the Firefox program, called your profile folder. Try creating a test profile, to see if the problem still occurs. See [[Managing profiles]]

Your above posted list of installed plugins shows that you have the Flash plugin (Shockwave Flash 10.1 r53). You can verify that you have the Flash plugin for Firefox on the [http://www.adobe.com/software/flash/about/ Adobe Flash Players Test Page] Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]] If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") ---- Your plugins list shows outdated plugin(s) with known security and stability risks. # Adobe Shockwave for Director Netscape plug-in, version 10.1 # Java Plug-in 1.6.0_07 for Netscape Navigator (DLL Helper) Update the [[Java]] and [[Shockwave|Shockwave for Director]] plugin to the latest version. See http://java.sun.com/javase/downloads/index.jsp#jdk (you need JRE) http://www.adobe.com/shockwave/welcome/