If I click a link to a .pdf file, Firefox will open up tab after tab after tab -- they go shooting across the top of the tab bar (it's incredible). I can use Task Manager to force FF to quit (and then manually end the Firefox.exe process since it doesn't seem to fully stop in a timely fashion). I have to tell FF not to "save and quit" otherwise on relaunch, it will just repeat the problem. If I just quit and manually relaunch FF, it is OK -- until the next time I open a .pdf link! I am using XP, so I used Add/Remove programs to uninstall Acrobat, and then I downloaded the new version and installed it. I re-checked the Acrobat plugin from within FF (Tools ->Add-ons->Plugins->Find Updates) and the current version is up-to-date. Help is appreciated!