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Had to revert to 3.6. Version 4.o would just sit a with the loading web page icon spining. 4.0 is 6X slower on my machine.

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Inspirion laptop. 2.8Ghz dual core pentium processor, 2mb ram, Windows Vista SP2 Upgraded to FF 4.0 this morning. Launched the new FF and could barely get a web page-----any web page to load. FF would just sit there with the loading web page icon spinning until I canceled the loading process and tried to reload the page numerous times. I deleted the browsing history and cache with no luck. Reverted back to 3.6 and no problems, sites load without all the drama. Don't know what the problem was but I spent all morning installing and then reverting. I'm not badmouthing FF like others have, but I will read the forum posts to be sure that new versions work before I upgrade again.