It's unlikely, Firefox has nothing to gain by following Chrome's example. On the contrary, it's good publicity not to. Other major browsers are based on Chromium, so they have to play Google's game whether they like it or not.
I personally have never used it, but Brave publicly said last year it will continue to support uBlock Origin despite bring Chromium-based. I'm not sure if they've changed their mind or how they plan to do it, but there's that.
https://twitter.com/brave/status/1725622768262128006
I don't know about other popular browser (like Opera), but if they're being so quiet about it they'll probably follow Chrome's footsteps.