Rated 3 out of 5 stars
Very good idea, has potential, but there are a few inherent problems. 1) Simply put, its a good idea and will certainly keep my eye on this for updates. 2) Seeing which tab is the currently open/active is difficult because of the different colours (although there are some options to tweak this, opacity for example, its still not great). Opacity doesn't help much, and the bold text looks ugly, and doesn't help much anyway. 3) The way that the colour is chosen is very rudimentary/limited. Sometimes it gets it so spot on, other times it gets it very wrong (e.g. a Google search should not have a black tab (with default settings) or a purple tab (with larger screenshot settings) - because of the "dominance" of the navigated links. Also, the default 'screenshot' options often, maybe just for me, choose a colour not representative of the page/site but of a slither of the top of the site - often above the main content of the banner). Again, there are some options to tweak this, like choosing the screenshot position and size, but this is a harder one to try and solve.
Highly recommended - and hopeful of future improvements.