I haven't had a chance to use it.
I like the idea, but I had to disable it.
It was flooding Firefox Debug Console with the following:

00:36:19.687 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
s moz-extension://a1c3dd70-392c-47d2-b444-966ef71714c5/h0-main.js:1
h0-main.js:1:198195

As an extension developer myself, this is a big nuisance while I'm trying to get some work done.