Very good. Lets me keep things together. And apart.

This plugin is great. I have removed my "facebook" sessions plugin and I use Tab Session Manager sessions for Facebook and Google now. Which means I can log-in to different Facebook and different Google accounts at the same time.

I keep another for private email and browsing. Another for work matters. Get the picture? It is like being able to have 4 or 5 computers running Firefox or 4 or 5 firefoxes on the go at the same time. And I believe in this time, this is a NECESSARY plug-in.

Pity is this is not on Mobile. A great hole in the usefulness is that containers themselves do not get synchronised. Is there a Sync. API for that plugins like this one can use?!

One 'extra' I'd like is for the "Always Open in ___" feature to accept sub-domains or a URL pattern. I'm putting that in here because I can't use Multi-Account containers with Google/Gmail when "[x] tick that box". With that off, Multi-Account keeps Google tabs separated. Just an idea.