Works well enough, current version is a bit buggy though, a few field boxes don't seem to work like the ones here on AMO https://i.imgur.com/2qi7xgw.png
Then there is the Exporting that seem to not work at all, And I've also had issues with deleting things with the manager, other then that works great and a fantastic timesaver.
There is one feature request I have for the Dev if he see this, can there be an option to remove this in the context menu https://i.imgur.com/dHTdxyw.png when highlighting text (I don't use this at all, and hate cluttering up this menu with unnecessary things). I do want it to be there for when I'm in field boxes though https://i.imgur.com/oYrCV8R.png
The Mozilla team is rolling out a fix for Firefox which should resolve the certificate issue affecting all add-ons. See their Twitter feed for details: https://twitter.com/mozamo/status/1124627930301255680