The thing is that it doesn't work with PM x64. IT does work with FF Nighlty x64, but I switched from them to PM for the sake of stability as the Nightlie's have been nightmare lately.
So the addon dev said:
I wonder if there's anything that PM devs can do or is it associated with just the addon (and just the addon dev can fixt it)?unfortunately, it won't work on Pale Moon due to an issue with Firefox's addon SDK relying on a hard coded name of some sort (I'm giving a vague answer because I can't remember the exact details)...