I'm not sure on stats or anything, I know Google has paid a lot of money to get Chrome as a default browser, but I remember a time when it became ubiquitous because the family nerd would tell their parents to use it and so on. It could possibly happen again and have a lot of people switch to firefox because their favourite site stopped working on Chrome. It's the kind of plan that could backfire pretty bad. There's a lot of legal reasons for their hesitance I'm sure, but I think that sort of thing would also play into it. A bunch of parents calling up their children because something stopped working and being told to download firefox isn't outside the scope of reality I don't think.