Rated 5 out of 5 stars

After upgrading to Mac OS X Lion and Firefox 10, I found the new chrome really hard to see and use. This add-on, used with the "Simple Transparent" persona, fixed the problem for me. PEX went from a toy to a necessity. (As compared to Personas Plus, which is as messed up as ever.)

This review is for a previous version of the add-on (2.1.1).