I don't know of anyone that knows how to program in Go. Some devs took a look at it when it came out, but you just can't develop for a single browser.
As for memory usage, FF does seem to use less memory than Chrome, however FF just doesn't give any of it back when you close tabs. If I start to run out of memory in Chrome I just close a few tabs, in FF I have to close the whole browser. There are times when I've had a single tab open in FF (after closing a bunch) and its still using 2+ GB of memory.