Suggestion Rated 3 out of 5 stars

Good product, but... I feel the goal is to make a Dynamic fingerprint, one that changes every time a new URL or tab is opened, that way your fingerprint is ALWAYS unique. To the tracker, you will seem to have an endless number of PC's on your IP addy. By only changing your useragent and OS to another static name won't help you, they will track just you with that new static changed information. You need something that changes every time a new URL or tab is entered.

This review is for a previous version of the add-on (1.3.0.1-signed.1-signed). 

Masking Agent

March 10, 2015: I added an option to use a different, randomized replacement text, in Masking Agent version 1.4.0. I also added a toolbar button to switch it on or off.

February 28, 2013: The goal of Masking Agent is simply to hide your platform information.