Firefox is building MV3 and while they are coy with deprecating MV2, we all know, c'mon, they won't keep MV2 even a day after their minimum year promised.
Their track record speaks against them.
XPCOM extensions? Killed, but don't worry, we will re-implement all the needed APIs as WebExtensions (didn't happen).
Fennec to Fenix mobile extensions? Killed, you get these 10 blessed ones, don't worry, we will eventually re-enable all of the webextensions on mobile, any day now, (didn't happen, you have to do hacky hacks involving nightly version to do un-blessed extensions).
This will likely be their third strike.
UPDATE: Or it's not nearly as bad as I expected. Per [1], while Firefox will be eventually deprecating MV2, the Firefox MV3 is much less 'evil' than the Chrome MV3, in that Firefox will continue to enable the WebRequest API without all the lock-down restrictions.
This makes a competitive advantage for Firefox in terms of adblocking power, if anything.
[1] https://news.ycombinator.com/item?id=32648925