An unrealistic expectation in my opinion. But you're welcome to take up that full-time job.
Fortunately, XenForo follows HTML standards and is not a super heavy "AJAX Web App" so it should remain usable in other browsers --
if somewhat ugly in visuals -- for a long time.
Btw I abandoned Firefox for Chrome. Even though it's a sadly bare bones browser, it has great performance and doesn't hang all the time like the Firefox 7/8/9/10/11/12/13/14/15/16/17/whatever madness which gets worse with each release.
