Fedora 21 Might Use Either GNOME Web Or A Custom Version Of Firefox, Built On GTK+3, As The Default Browser
The Fedora developers are discussing whether to replace Firefox with Gnome Web as the default browser on Fedora 21, due to the fact that the current Mozilla browser is built with GTK+2 and GNOME 3.14 uses GTK+3.
Gnome Web (previously name Epiphany) uses GTK+3, has support for HiDPI displays, provides good integration with Gnome Shell and supports hardware acceleration, while Mozilla’s browser doesn’t.
Due to the fact that Firefox is open-source, some Fedora developers have already started to port Firefox from GTK+2 to GTK+3. If everything goes well, the first GTK+3 based Firefox will be built on the Firefox 32 code base.