Well, unfortunately the Firefox will require data collection to be disclaimed soon enough from all extensions and we'll be seeing a lot of those questionable permissions.

In case of UltraWideo, if you are free user, you have nothing to worry about and if you are paid user, you already know which feature will use "surf activity".

To clarify:
personallyIdentifyingInfo - voice input, license key and instance id (none for free user)
browsingActivity - Pro settings sync of per-site keys
technicalAndInteraction - install id, extension version, review prompt

Hope that clears things out for you and any users that come across this page.

Best,
Nenad.