ABE is sort of a firewall, but not in the usual sense. It's a firewall for web applications.
When your browser downloads a web page, the page can (and usually does) include instructions to fetch resources from other sites. ABE acts as a firewall for those requests, determining which sites can interact with each other.
It's uncommon, and not usually desirable, for a website to want to contact a site on your local network. But it's not unheard-of. Anyway, as barbaz mentioned, allowing 127.0.0.1 should make no difference to ABE, which is a separate module.
When your browser downloads a web page, the page can (and usually does) include instructions to fetch resources from other sites. ABE acts as a firewall for those requests, determining which sites can interact with each other.
It's uncommon, and not usually desirable, for a website to want to contact a site on your local network. But it's not unheard-of. Anyway, as barbaz mentioned, allowing 127.0.0.1 should make no difference to ABE, which is a separate module.