Great plugin! But broken with FF 75.0 (64-bit) Win7

Subject says it all. Upgraded FF to 75.0. Noticed it wasn't working.

I deleted the plugin and tried to re-install, and got "plugin appears corrupt."
Another attempt and it works, for a while. When I uncheck the two "reload" buttons in config, stops working again. 

This is a great plugin, and I use it often. Please update if you can! Thanks. 