> They probably have enough money from Google anyway, why would they need any other?

If I was in charge of Mozilla's finances (which I'm not), I would be perpetually anxious about Google yanking their money as soon as its lawyers are sufficiently convinced that another browser vendor's marketshare sufficiently deflates any accusations of monopoly.

If Google yanks their money, they're dead anyway. Unless they make similar arrangement with Microsoft or such. I don't see how they can exist and finance themselves as an independent entity.

Hence the fundraising. I don't personally find it surprising that "you're dead anyways" isn't an acceptable conclusion to Mozilla's leadership, regardless of whether it happens to be likely.