Can't use in Beta 6... Rated 3 out of 5 stars
A great add-on, but it's incompatible with Firefox 4.0 Beta 6.This review is for a previous version of the add-on (18.104.22.168).
should be fixed now
Can you please try the latest beta version from here: http://www.ietab.net/forum/general/11/fix-hang-crash-when-using-back-forward-or-hot-keys
It should now work in Fx 4.
I'd love to get you to a 5-* rating :-)
Thanks! - Don