This isn't quite true. Support for legacy extensions is disabled by default, but can be re-enabled via the `extensions.legacy.enabled` flag in about:config.
Re:Firefox 57.0 Released
by rebelwebmaster on Tuesday November 14, 2017 @09:47PM
(#15701118)
Don't expect it to work very well, though, given that a lot of the supporting code for legacy addons was already removed from Gecko 57.
Huh, thanks for mentioning that! I didn't realise there was still a flag for it - serves me right for not doing my research.
Though losing Electrolysis will defeat one of the main benefits of running Firefox 57...
Though you lose multi-process operation, I think....
Re:Firefox 57.0 Released
by branchless on Tuesday November 14, 2017 @10:41PM
(#15701286)
only on incompatible MP plugins.
however I've just ran nightly and although it says vimfx will work as a legacy plugin it's not working, so the deal's off. I shall not use my mouse!
You can try vimium-ff (FF 57-compatible). There is also Tridactyl [1] currently in development.
This is a good thing, and it's just a shame that so many addons haven't been updated yet.