Me be Vivaldifarian since Feb 2015, but... for the past couple of years i've oscillated between FF-Nightly & V-Snappie. Atm [since a few weeks ago] i'm back in the Nightly phase. My current extrapolation is that this probably won't change again before 2022... unless Santajon surprises me with V's own TST & Nix-DoH.
Into 2022, i remain very concerned about gargle's impending Manifest v3 full-deployment. If, as seems increasingly likely, it kills uBlock Origin & uMatrix [& clever @gorhill can't find a wriggle-around], then i truly can't envisage me ever using any chromium-based browser as my default ever again... notwithstanding how much i do adore V.