For those wondering if there are any viable alternatives, there is Brave and Vivaldi - both privacy focused browsers but use Chromium and therefore will have Manifest v2 end this year. Ladybird whom everyone is hoping will be a solution in the long term is currently in alpha and from my brief use of it, is certainly not anywhere near ready for daily driver use. In terms of a Firefox fork that is viable, I have seen a number of recommendations for Floorp being a Japanese fork and likely to be shielded from the SJW's but is several versions behind Firefox at the moment.