Not bad. One annoying feature though. Rated 4 out of 5 stars

All I really needed was a good way to see two tabs in the same window. It does that wonderfully.

One really annoying con though: the added tabs view CANNOT be navigated via the main window's address bar. Every tab you add opens with its own separate navigation bar. That is incredibly confusing, inefficient, and really annoying when you keep hitting the back button, and messing up where you are in another tab you aren't meaning to use at the moment.

I've not found any way to change that in the options.