Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). * Don't make any changes on the Safe mode start window. See: * [[Troubleshooting extensions and themes]] ---- See: * http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions ---- Your More system details list shows that you have an incompatible display driver for your ATI Radeon HD 4800 Series graphics display and that WebGL is disabled. You can try to update that driver as recommended on the Help > Troubleshooting Information page.

Thanks muchly; problem solved.