This is a very effective extension but it is not without some drawbacks. First, the lite version only allows 5 sites but the full trial is forced on you for several months. This means you have to manually uncheck it for every site you don't want it on. Second, it really eats resources. Third, bugs. A few months ago it was crashing tabs that didn't like an update. A couple of weeks ago an update introduced a memory leak which locked up my entire computer. It took several days to narrow down the source of the leak and yep, it was this addon.

If they make the full version opt-in so that you only get the five free 5 sites and the addon isn't eating all the system resources trying to change all the other tabs then great. Until then I'll avoid it.