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Re:Firefox 53: Quantum Compositor, Compact Themes, CSS Masks by fiatjaf on Wednesday April 19, 2017 @02:19PM (#14150281)

  The storage.sync API allows add-ons to 
  save user preferences to Firefox Sync, 
  where it can be shared and synchronized 
  between devices.
Now all Chrome Extensions automatically work on Firefox.
Re:Firefox 53: Quantum Compositor, Compact Themes, CSS Masks by erikdesjardins on Wednesday April 19, 2017 @03:19PM (#14150865)
Not entirely, there are still some APIs that are unimplemented in Firefox[1].

But yes, adding storage.sync will help a lot.

[1]: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Br...

Re:Firefox 53: Quantum Compositor, Compact Themes, CSS Masks by pmezard on Wednesday April 19, 2017 @02:37PM (#14150474)
That's fairly nice now Firefox extensions stopped working in Firefox.
Re:Firefox 53: Quantum Compositor, Compact Themes, CSS Masks by rhelmer on Wednesday April 19, 2017 @02:57PM (#14150674)
Legacy Firefox extensions still work in this release, it is 57 that will be WebExtension-only.