It literally broke the first website I tried it on.

Functionary not

Mostly good and has been helpful for the vast majority of sites. However, a recent update has made it incompatible with Roll20 virtual tabletop game pages, which I use regularly; I can access the rest of the site just fine, but the pages on which the VTT portion is accessed just shows up as a blank black page. Please fix!

I like it a lot! It lets me adjust how "white" the white space is -- much better for the eyes!