update 5-4-20 I get it now they won't allow install from tor browser cuz they want to track all your logins using the so called private containers. BS Also Mozilla login here is a royal PITA maybe they don't want more reviews/ WHY IS IT RECOMMENDED? WILL NOT INSTALL: ERROR: FILE IS CORRUPTED
There are a couple of things that can cause this. You could try https://discourse.mozilla.org/c/add-ons/add-on-support/ to troubleshoot over the forum.
