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CloseReview for Single Key Tab Switch by Kinseek
Rated 4 out of 5 stars
Excellent. This is the one feature i sorely missed from Opera when I switched to Firefox back in the day. Having to stretch my fingers for more then one button feels very clunky. This one worked perfectly - and on the 4.0b as well.
I would request you extend the functionality also to have Z and X be Back and Forward respectively. Having CTRL-Z reopen the last closed tab would also be neat. These are the remaining shortcuts i miss and which are easier than the default Firefox's.
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