I'll happily "loose" this whatever this discussion is if I'm wrong (but the "win" reference is now removed from your comment) but the basic idea is: 1. Servo s

I'll happily "loose" this whatever this discussion is if I'm wrong (but the "win" reference is now removed from your comment) but the basic idea is: 1. Servo supports many web standards, not XUL 2. The firefox UI used to be built in XUL 3. The firefox UI is now not built on XUL, but rather on web standards This means that the firefox UI can now be rendered by servo or similar components. That's basically the parent comment. If you disagree with any of those facts that's an interesting discussion, but I think you think that somebody said that the firefox UI could not be built on gecko previously, which nobody said.