Great!
It's still alpha and already very useful.
I really don't understand people here who are complaining about missing functions, no one of them ever tried to do something with their own hands, just whiny, lazy bones.
The author seems to be a one-man-show, he does a great job for all of the firefox users, THANK YOU!
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And don't forget, the large. commercial, money earning Xmarks team with all their resources was UNABLE to MAINTAIN something useful, shame on Xmarks!