Rated 5 out of 5 stars

Can we get an option to open this in a tab, i would love to have this as a pinned tab. Currently i do that with mibbit but on every startup i have to manually join all my regular channels.

This review is for a previous version of the add-on (0.9.92). 

You can open chrome://chatzilla/content/ in a tab, and it'll work on release/non-e10s versions of Firefox. I don't know if that trick continues to work when e10s is on. There are a number of slight drawbacks to this, mostly relating to the context menu and how links open, IIRC.