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Comment by fiatjaf | Hacker News Reader

  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.

Not entirely, there are still some APIs that are unimplemented in Firefox[1].

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

That's fairly nice now Firefox extensions stopped working in Firefox.

Legacy Firefox extensions still work in this release, it is 57 that will be WebExtension-only.