I just love what this extension does, preventing cross-talk between activated Container tabs! There is one, rather large, caveat, however, in that when initially setting up a URL in a designated Container, it easily completed, and it looks like you're done! BUT... the next time you use that URL (say you Bookmarked it), you are presented with a Container verification screen, where you have to say, "Yes, I actually DO WANT to use the Container that I thought that I already HAD set up!" What this means is that once you setup a URL to a Container, you have to immediately TRY that URL (possibly Bookmarked) to answer that verification page. THEN...everything works as expected. I consider it an inconvenience, but once you are used to jumping thru the hoops, its 2nd nature. And that does not detract from the purpose or function of the extension!