@popey here talked about the differences between derivatives, remixes and flavours. As I understand this, remixes like our Ubuntu Unity Remix are allowed to mantain a small number of packages in their own PPAs. I wonder in the future what we’re going to do with firefox. Ubuntu Budgie, Kubuntu and Ubuntu Mate all have Global Menu options in their DEs, so the patch for global menu in firefox (and Thunderbird) could actually be important for other flavours as well. Global menus are an important part of Unity. I hope Canonical will allow us to mantain a patched version of Firefox as the one in Xenial repositories.