Re: Who has paid for the survey?
And none of those are the distros listed in this report. I mean, Ubuntu is, for example, but not "Ubuntu without a DE". If they're separating out Windows 8 and 8.1 when they are certainly separating out Ubuntu and Ubuntu Server.
They don't list "Ubuntu with a DE" either… They just list Ubuntu, and with Ubuntu, it is a user choice (default: enabled) as to whether a web browser is installed or not.
Firefox is generally bundled because it happens to be one of the better ones. Maybe Chromium might take its place some day. If you install Kubuntu instead, it comes with Konqueror rather than Firefox.