After the latest update I had to remove the extension because it is using very quickly all the RAM and the browser does not work anymore. I spent quite a lot of time understanding what was going on and I finally tracked the issue to this extension using about:performance

I don't know who this is or why i got here!

In Firefox Very Difficult Instaling

Blank screen

no

The secret key video doesn't work, with error: "No video with supported format and MIME type found." Using latest FF, with uBlock origin turned off. Useless.