Rated 4 out of 5 stars

Almost perfect. I wish I could drag'n'drop a link to the autohidden tabbar to create or replace a tab. One way perhaps would be to add drag'n'drop as an optional trigger for showing the tabbar (in addition to ctrl etc). I am using it as a way autohide the standard FF tabbar (with Tab Mix Plus). A simplified autohide for Tab Mix Plus would be another idea.

This review is for a previous version of the add-on (0.7.2009032801).