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i normally using 5 or more tabs at once..sometimes i cant close tab or i cant stop loading it.i use firefox 12,updated version.

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when i trying to close tab,it seems like close button had the click..and i can click on close butter more than 10 times..but tab isnt close.so always i have to restart firefox..and also i cant stop loading a page..same problem goes there

when i trying to close tab,it seems like close button had the click..and i can click on close butter more than 10 times..but tab isnt close.so always i have to restart firefox..and also i cant stop loading a page..same problem goes there

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You can manually stop the loading of a page by pressing the escape key.

Also, try turning off hardware acceleration in Tools>Options>General, Firefox 12 runs very slowly and doesn't respond a lot with it on.