Eventually after years of waiting FF got fast enough and the devtools were good enough (and chrome got creepy enough: the automatic browser sign-in made clear chrome was tightening the noose of browser/web/google lock-in). So I switched back a year or two ago and have been quite happy with it! This news indicates it won't be long before I have to switch again.
Mozilla's strategy seems so incoherent, at least from the outside. Who is their target demographic? Perhaps "power users" & developers like me are too small a demographic to be worth competing for (see also: the toyification of the macbook pro). But I seriously wonder if Mozilla as a nonprofit has a path forward without keeping some of the "power users", (casual) privacy nerds, and FOSS folks in the fold. Are they planning to compete with Google for casual users as "just another browser"? I really don't see how they plan to beat google in this arena.
EDIT: In Mozilla's defense, no I have not donated anything to the organization to keep FF or MDN development running (though I have contributed to MDN & FF in small ways) so perhaps I share some of the blame here. TBH I'd donate if I knew it was going to FF & MDN and not one of the two thousand other little projects Mozilla keeps starting and killing.