Damn.. I was looking for some tree tabs with tab grouping.. This.. it looks perfect.. Unless i end up with some annoying bugs or performance issues I'm sticking with it :D Great Job :D

If there's one or two things I'd love to see..
edit: actually option to switch Multi Account Containers displayed icons to STG would be perfect.

Great start. Big future

Very nice addon, well designed, and adds real value to the tabbing process.

I keep lots of tabs open -- all day -- personal, work, client etc, and this addon is the first I've come across that makes containers actually useful!

This extension is amazeballs. It kicks the pants out of the other vertical tab offerings!

Well done. Thanks for creating it.