It essentially already has http://www.palemoon.org/

The Palemoon developers understand the folly of ditching the flexibility of the XUL interface. They won't be removing it.

And then the person who forked it gets to maintain it!

Lucky them.

No need to be so snarky, he'll have all those other people out there who love XUL to help him.

He's right. Mozilla, a $200-300 million a year outfit, currently maintains their software including Firefox. It's a huge C++ application. People who code XUL in their spare time, even a bunch of them, aren't likely to make a dent in keeping parity between a Firefox fork and the main release. They'd likely have trouble even porting it.

So, a fork is a rough solution and will have maintenance issues for an app this size.

I was being facetious.

Ah. You got me there haha.