"Full network access" permission by default is enabled

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Hi there!
We released an app for changing phone contacts prefix (https://play.google.com/store/apps/details?id=com.idealink.prefixerplus).

When looking at the permissions tab in google play store I have seen that there is an additional permission, that we do NOT request - "have full network access". Some poeple says it's kinda suspicious and they are not sure if to download the app...

It seems that FF by default requires this permission. Any ideas what to do?

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