
However, if I log into Windows as user Bob and launch FF normally, the problem does not exist. If I close FF and launch it as user Bob (shift+right-click Firefox Shortcut, choose "Run as different user"), the problem will appear. For example, if I log onto Windows with user account Adam and launch FF normally, the problem does not exist. The plugin does not crash when Firefox is running under the same account that is logged onto Windows interactively - only when running FF as a different user. It seems the plugin is silently crashing - I'm not alerted to a plugin crash in any way (no dialog or yellow "Flash player crashed" notice at the top of the window), but after FF hangs I will see a new crash report entry in the FF about:crashes list. Disabling the Flash plugin eliminates the problem. When Firefox becomes responsive again, scrolling a page with Flash content will cause the app to hang again.

After upgrading my Flash plugin to v11 (11.8.800.94), the browser will hang for several minutes when visiting any page that contains Flash content. I often start Firefox in Windows 7 (圆4) using the "Run as different user" mechanism.
