It may show that I gave it a 1 star but its only because I could not give it a -5 rating!
This is a totally unreliable Add-On! I suspect that all the people who have given it 3-5 stars are just trolls wanting to mess with people.
Mozilla should write an algorithm for detecting add-ons that have a high amount of bad ratings, then personally check them out; and remove them when they see that they are not doing what was promised.