In /browser/themes/windows/jar.mn, we have duplicate references for all resources. One reference points to an aero specific file and a separate reference points to a non-aero file. Sometimes these reference different files within the repo, but often times they don't, and this duplication is easy for people to miss when writing patches and it's also quite cumbersome. It would be better if we had a smarter way of managing these resources.

Not only that, as far as I know we also duplicate the actual resources if they're identical, because they end up in the jar under both the aero and non-aero path, and Windows doesn't do symlinks so we are just shipping the same bits twice.