I'm on XP3,SP3 desktop and my add-ons for Firefox have disappeared on the browser bar. They are showing in my 'Tools" menu, but for some reason they aren't showing in my taskbar on the browser window. Haven't changed anything, but just noticed they are gone. Alexa Sparky is the primary one. Attempted to download it and install again, same problem - it installs in the tools menu, doesn't show on the browser.

Any suggestions - could it be java related? Thanks for the help. Oh, I'm running Firefox 4.01