Ripping out XUL baggage is fine, it doesn't matter which language UI elements are described in. Yes, it would require to rewrite stuff, but that's manageable.

Ripping out XUL baggage is fine, it doesn't matter which language UI elements are described in. Yes, it would require to rewrite stuff, but that's manageable. The important part is ability to replace (overlay) chrome resources, patching/extending the browser code. I hope that's going to stay for a while.