Rated 2 out of 5 stars
I'm really sorry to say this, guys at Mozilla Labs. You're hard workers and good at what you do, but this add-on... it's just flawed.
I installed it hoping for a nice experience, only to find that my tab bar was completely covered and incredibly hard to get to.
Even the basic functionality didn't work out for me. I tried clicking one of the little picture versions of the tabs, but it was unresponsive.
I had to move my pointer around every possible spot that the add-on visually covered, and I eventually found the super secret navigation bar. I had no choice but to type about:addons and disable it.
It's a nice idea, but it's really not ready for usage, but that s to be expected, given the fact that it's in experimental stages.