Is it a Phoenix bug?

I’ve been trying out the latest nightly of Phoenix and was about to complain that form scrollbars were broken. Turns out that bug 170184 is undoubtably the cause. Sharing most of the codebase with the Mozilla trunk has many advantages, but running into this kind of problem when you’re trying to release a milestone has got to be frustrating. Since Phoenix contains so much of Mozilla, determining where a bug is may be challenging. At least they’re in the same bug tracking system so it will be easy to move them if they’re incorrectly classified.