Re:Firefox 57.0 Released
by itaris on Tuesday November 14, 2017 @09:10AM
(#15695066)
It's worth noting that most legacy extensions still actually work. You just need to enable them.
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You can't enable them in the release version of Firefox. You'd have to use Nightly, I believe.
That might be true for this release, but Firefox has committed to moving away from XUL. That means your extensions are guaranteed to break eventually.