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Scam-backscatter
Scam-backscatter prevents backscatter (accept and bounce) on mail servers which don't host mailboxes locally....
mail server validates mailboxes prevent backscatter Scam-backscatter validates
Prevent Tab Overflow
This Firefox add-on prevents your tabs from going into overflow mode...
bug832641 (prevent slowness menupopup)
This Firefox add-on will prevent slowness of pop-up menus...