I don't see anything about why the beta, but I did see the following in the FAQ. Maybe this will help: "There will also be special unbranded versions of Relea

I don't see anything about why the beta, but I did see the following in the FAQ. Maybe this will help: "There will also be special unbranded versions of Release and Beta that will have this setting, so that add-on developers can work on their add-ons without having to sign every build."