[majewsky]

If forking Firefox was a viable route, would someone not already have done it?

[solardev]

There's not really a strong incentive to while Mozilla is still around (and despite that, there are still a few forks... Waterfox, for example). I think it would take a collapse of Mozilla, Oracle-style, to really spur that.

(edit: Oracle didn't collapse, I mean what happened to OpenOffice.org.)