[yardshop]

They are persistent, but I don't think they are tied to a window (I mainly just use one). But your groups are kept as you left them after restarting.

I have 7 groups right now on my home machine, and that many or more on my work machine. Each has a few to a large number of tabs in it. I have about 28 in my current one. Each group contains tabs about a different topic, such as daily visit sites, searches and articles for ongoing development in a particular language, research into specific projects, or random lookups.

I also use the Tree View Tabs extension which show tabs in a hierarchical list on the left, instead of across the top. This is a better use of space for me and shows the relationships of tabs.

I am going to miss both of these severely if the XUL plugins go away this fall as they are saying. My web workflow is much more efficient with them, at least in Firefox. I like using Chrome, but with a lot of pages open I just have a squished up mass of tabs across the top that can't be easily read, it's a big bother.

Anyway, I wish there were more extensions for more browsers that improved the state of managing large groups of tabs by topic.