Wonderful for what it does! Rated 4 out of 5 stars
Firefox started with the "Not Responding" thing for a while, so I reset it. Seems I'd forgotten to get MaskMe again, but I did notice FF was behaving normally. Today, I realized my MM was gone, added it, now FF is acting up again. MM seems somehow to interfere with Firefox! That's way too bad!This review is for a previous version of the add-on (1.39.345).