User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1 Build ID: 20120614114901 Steps to reproduce: I opened a Firefox window. When I tried to move it around by clicking and draging on top of the window the window does not always move. Actual results: The window stayed at the same position on the screen Expected results: The window should have been moved around.
Try running firefox in safe mode. Menu -> Help -> Restart with add-ons disabled -> Continue in Safe Mode. If it works in safe mode, then one of your add-ons is causing the problem. The only way to troubleshoot this is to disable all add-ons, and re-enable them one by one to find out which add-on is causing the problem. If that doesn't help, create a new profile to see if it helps. You can still keep your current profile so creating a new profile won't cause you to lose your bookmarks, passwords, preferences, etc. http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
Component: Untriaged → Shell Integration
QA Contact: untriaged → shell.integration
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