How to make it work with Firefox 4beta10 Rated 5 out of 5 stars
With a simple tweak you can use it with latest betas. It works with beta 10. In about:config find browser.sessionstore.max_concurrent_tabs and change it's value from 3 to 0. Restart FF and enjoy. Use beta 2.1b2 version of BarTabThis user has a previous review of this add-on.