Aw! I hope not. I switched to Edge recently and I've been happy with it. That would mean having to go back to Vivaldi :/

I switched to Edge from Firefox for a couple of weeks. Works well but I'm back on Firefox now - there are a couple of Firefox features I've come to rely on like the containers and the sidebar.

Yep I must say containers are best thing in firefox.

Have you tried Brave?

Does it actually stop working, or will it just be slightly more limited?

As far as I know, Gorhill has no interest in porting it to use a separate API, so effectively it will stop working even if in theory you could have a more limited fork.

I might be wrong on that though, please jump in if there are plans I don't know about.

It's surprising to me that Microsoft is planning to deprecate the old API, I thought their plan was to support both in parallel. Surprising and disappointing, I haven't seen any indication that the fundamental problems with the declarative API were ever addressed.

I don't think it's that Gorhill doesn't want to port to a separate API, it's that they have no interest in making a crippled blocker.

Manifest V3 as specified by google isn't a slight limitation. You must ship your much smaller block list with your extension and only update it with extension updates and due to effectively being limited to only providing a slightly different list of sites to block instead of methodology of blocking your ability to block an evolving threat will be limited to how fast google an ad company opts to evolve their technology to block their own revenue stream.

It only wont immediately appear as the total destruction of adblocking because it will require months for people to all adopt new browser versions and developers are likely to take months to adapt their tech to the point where your adblocker effectively stops working for 90% of ads after which it will basically never work again.