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Re:Firefox 56: Last Stop Before Quantum by tincholio on Friday October 06, 2017 @04:31PM (#15420197)
At least for the time being, you can use legacy extensions, by enabling the right option [1] in about:config.

[1] extensions.legacy.enabled -> true

Re:Firefox 56: Last Stop Before Quantum by thatcks on Friday October 06, 2017 @07:16PM (#15421153)
You can enable legacy extensions but this is not the same as being able to use them. Many significant and important-to-me legacy extensions (such as FireGestures) are currently non-functional on Firefox Nightly and have been for some time. I can only assume that Mozilla has decided that they don't care about keeping any legacy extensions working other than their own (they have some).