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Though you lose multi-process operation, I think....

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.

1: https://github.com/cmcaine/tridactyl

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...

Only in Nightly.

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.