clacker
BSOD
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Since i updated to firefox 4 I am having a standard issue when something requires to be opened in a new window this message appears "what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined" When a click ok it allows it to open but boy is it annoying. Never had this problem with any of firefox 3 versions. Also speed can lag at times then suddenly page timeout message will appear. Once try again or refresh is clicked the page suddenly appears at super speed. I want 3.6 back was very happy with that version
Try installing it again.