TenFourFox Feature Parity Release "16.1" (SPR 1) is now available for testing (downloads, hashes, release notes). As noted, this is a pure security update and there are no user-facing changes; the big under-the-hood change of those is that we are now pulling entirely from 68ESR, including locale data, certificate roots and so forth. There is also a small update to the ATSUI font blacklist. Assuming no issues, it will go live Monday evening Pacific time as usual.

http://tenfourfox.blogspot.com/2019/10/tenfourfox-fpr16-spr1-available.html