Rated 5 out of 5 stars
just updated and read down the reviews (actually the guys' thankfulness) of addon "2 Pane Bookmarks", and found my lovely "tree style tab" also renewed to support ff20. incredible!
(quote "impossible for me to move to a different browser." by stubi.)
Thanks a minion!
(p.s. : if guy like me, like to read down the reviews, one should check a addon called "pageexpand, a new and wonderful addon)
Incredible addon! Firefox have to be impremented in default. Rated 5 out of 5 stars
It's a must! and being the best, paired with "Tab group manager" to organize the tabs with "group tabs" and "tabs group", firefox still startup fast when "Don't load tabs untill selected" enabled.
Best of all, It's keeping pace with firefox update (currently I'm using 10.0b1), and work well with them.