locked out of using the menues
None of the pull-down menus work in Firefox (file, edit, view, etc) and none of the other pull-down menus such as browse history, most visited, etc. click down either. What happened?
Alla svar (1)
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems