I'm considering installing a Firefox add-on (browser extension) which requests the permission
Access your data for all websites. This add-on is not on the list of Mozilla's "actively monitored" add-ons.
Since it's reasonable for this particular add-on to require that permission in order to do its job, I'm okay with this -- but only if the add-on does not also have the ability to exfiltrate / "phone home" data from sites I access, via network requests. (Either now, or in the future via an automatically-applied update to the add-on.)
Which of the 26 permissions (as of the time of this question) govern the ability of Firefox add-ons to make their own network requests? Or is the ability to make additional network requests silently available to all Firefox add-ons?
Related existing (but less specific) questions: