According to the add-on policies, we need all the features provided by the add-on, to be opt-in and not "on by default"
The features must be “opt-in”, meaning the user has to take non-default action to enact the change. Changes prompted by Firefox after the add-on is installed do not require an additional opt-in. The permissions prompt shown when installing an add-on does not alleviate the need for an opt-in.
According to the add-on policies, we need all the features provided by the add-on, to be opt-in and not "on by default"