I upgraded to WebExtension and Firefox 57 today on my work machine and was pleasingly surprised how smooth it was to import settings from legacy version. GUI is a bit different but overall it works like a charm. Use cases I use daily were ported perfectly.

As a fellow add-on developer I can truly appreciate how much work and time was invested to make this rewrite possible.
This add-on is extremely important to me, been using it for years and will use it for many years to come.
Thank you so much for creating and maintaining it!

PS. Please do not get discouraged by less technical people that use reviews to state temporary frustration. I am sure everything will get back to normal next month, when everyone moves on with their lives.