Speed up FF by clearing disk cache. Love it. Rated 5 out of 5 stars

Sits in the Add-on bar. Displays the status. Works on FF 21 perfectly. I agree with Mark M's comments. It a "must have" to manually clear a bloated disk cache - quickly.
P.S. The OK button in options works for me. Win7Ultimate.

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