Hey! First of all, congratulations with 0.99.120 release - it is awesome!
A minor suggestion. It'd be nice if, when I click Tab Overview button, a "search tabs" input field would get focus automatically. I don't think it breaks any existing flows (does it?), and it adds conveniece for those who do search tabs.
Another tiny convenience would be if hitting Enter (when searching tabs) would select the first tab in overview. Right now, if I type something and hit Enter, web search invisibly happens. Weird!