Rated 5 out of 5 stars
This is a fantastic add-on which I have installed in SeaMonkey and Pale Moon as well as Firefox.
Pale Moon will continue to support "legacy" (XUL) add-ons indefinitely, so I would like to encourage you to add Pale Moon support officially. I notice that it is breaking in newer versions of Firefox, but it is wonderful and still going in Pale Moon. You could even list it at the Pale Moons Add-ons Site.