Rated 5 out of 5 stars

Please fix?

Temporary fix is to toggle the about:config entry
extensions.allow-non-mpc-extensions to 'true'
This will eventually fail, though, as multiprocess advances.

The extension is also marked as "Legacy", that is, not a web-extension, thus will not survive FF 57 in November unless re-written. This is a dark tragedy.

This user has a previous review of this add-on.