Uninstalling dont help much if you recycle old profile. See what you have by starting Firefox like this "firefox.exe - profilemanager" Each profile has your bookmarks, cookies, extension data. Often a good idea to start from scratch when updating program version. Problems can be hard to solve if simply reinstalling extension dont help http://kb.mozillazine.org/Profile_Manager
Im not sure if you are asked about deleting profiles during uninstallation. I think you are - be careful not to lose data. Just leave it and chose a new with profile manager. Same manager also lets you delete profiles or you can do it in Explorer, no need for uninstall process to clean up.
Every time you install extension check Add-on menu and see if "options" button is activ. Not all are user friendly, doing these clicks are sometimes only way to set it up right.
Im not sure if you are asked about deleting profiles during uninstallation. I think you are - be careful not to lose data. Just leave it and chose a new with profile manager. Same manager also lets you delete profiles or you can do it in Explorer, no need for uninstall process to clean up.
Every time you install extension check Add-on menu and see if "options" button is activ. Not all are user friendly, doing these clicks are sometimes only way to set it up right.

















