The user agent is a browser's ID, it's how it presents itself to the world and it's how websites choose to treat it. There are several standard, or at least accepted, ways of displaying the user agent and websites have learned how to deal with the various syntax used by browsers.
Because of that, any change to the user agent is a tough call as it could affect a large number of sites, especially if their code is rather sloppy.
But Mozilla is moving to change the user ..................
string(42) "consider a new peer alice that joins bit.."
consider a new peer alice that joins bit..