Comment 61 for bug 191889

I couldn't get ubuntu to connect in the networkmanager mode (whatever it is), and I have also heard complaints from Fedora users.

Sure we might be doing something to work around a problem in a distribution. If that distribution represents a large enough portion of the user base I think that is a reasonable things to do, and I know Mozilla have done similar things in the past (disabling IPv6 where certain platforms were broken). I do not know what the figures are, I can only say I am seeing this issue crop up frequently.