This is awesome! :) Thank you so much for open sourcing it too, I will likely use it as a base for a browser version of http://keeporsweep.net – seeing as you wrote this extension, maybe you are interested in that project too?
Why do you want an update? The current version works just fine with the latest versions of Firefox.
P.S.: There's a version 2.0.0 coming out (it's in review at the moment) which has been rewritten for the new WebExtensions API. That might work better for you. Edit: PaleMoon? Never heard of that before. No idea why it doesn't work like it does on Firefox, but if you have any suggestions on how I might fix it, I'm all ears.