Works nicely on Firefox Desktop, but it seems to have issues in Fennec Nightly — I had tried it before, and it plain and simply didn't work; but I just reinstalled it (after some time of disuse) and while it cleans the first link (with utm tracking parameters) it fails to clean the Amazon.com link. Weird. Again, it works fine on Desktop Stable, but at least on Fennec Nightly your mileage might vary. I cannot test on Fennec Stable/Beta/Aurora, so... Keep it in mind.