Legacy Firefox Android has some quirks around vibration where it:
- asks for permission
- doesn't persist the permission
This makes the default like vibration popup a permission on Firefox
Android <= 68.
This isn't the case (yet?) on their new Firefox which is rolling out
worldwide right now.
I'd say we merge this now and revert in 3 months or so when
https://arewefenixyet.com/ shows a full rollout.
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