Examine source code of Northern Aurora

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersonalizethingermajiger.jpg"
    },
    "colors": {
      "frame": "#416e8a",
      "tab_background_text": "#596c99"
    }
  },
  "version": "2.0",
  "name": "Northern Aurora",
  "manifest_version": 2,
  "description": "Northern lights"
}