e10s ? Rated 5 out of 5 stars
It seems it doesn't support e10s but since e10s is disabled on my profile, I couldn't say if it still properly works despite that.
I know mozilla changes too frequently and it's pain in the as* for dev to maintain their add-on. I empathize with you. I hope it will be compliant with future firefox release. I love it.
Do you plan to update it?