When problem occurred, Firefox 5 had been used trouble-free from Beta. Now, whenever Firefox is selected from the desktop, a dialog box appeared: "Warning. Unresponsive Script". Script: chrome/tavgp/content/libs/include js.595. Button options are: 'Stop Script' or 'Continue'. Selecting 'Continue' has no effect; 'Stop Script' enables Firefox to run, seemingly OK. I have uninstalled Firefox 5 then re-installed, but the problem persists.