If you go to the "Bookmarks" section of the [[How do I use the Awesome Screen?|"Awesome Screen"]] then you can press and hold on a bookmark to edit or remove it. There's currently no way to sort or move bookmarks in Firefox for mobile. If you have [[How do I sync Firefox between my desktop and mobile?|Firefox Sync]] set up, then you can use the bookmark manager on your computer to organize bookmarks inside your "Mobile Bookmarks" folder, and those changes will by synced to your Android device.