Once and if it is fixed I will give 5 stars, sure. I am not going to give 5 stars to "encourage and support" the developers to do this, one day, maybe. Sorry, no, that's not how it works.
This is junk until fixed and it should have either been fixed over to the webextensions standard during the more than 1 year Mozilla gave or it should have continued to stay disabled as a legacy add-on until it was ready. Rolling out a broken update and expecting anything other than 1 star is whack.