Worked great for me! Doesn't bring back clear-all functionality on Firefox, but it's a decent minimal theme in its own right. Still beats default Gmail :P

An excellent example of the useless add-ons.

I thought it was something like Simplify but it turned out to be so bad that I had to uninstall it at the same moment. No text was visible in my case.

Menu on the left is blurry.

Does what it says!