[iggldiggl]

> Probably not. By the time the switch for release (non-nightly/beta) Firefox comes, I expect all the currently supported extensions will still be supported.

I think you're being too optimistic - the fact that the regular Nightly and Beta release channels have already been transitioned to the rewrite means that at the same time you've lost all large-scale capacity of doing any pre-release testing on the old version. While that one has been getting ESR-style bug fixes only for quite a while anyway, even those still need some amount of testing. So barring some major hold-ups, they're now committed to transitioning the Release channels in the near future as well, even if that means mediocre add-on support and quite a few other missing things.

And it's been clear for quite a while that they've decided on a https://www.joelonsoftware.com/2000/04/06/things-you-should-... -style rewrite for better or for worse...