Examine source code of RAGE 2

{
  "name": "RAGE 2",
  "manifest_version": 2,
  "version": "1.4",
  "theme": {
    "images": {
      "theme_frame": "empty.jpg",
      "additional_backgrounds": [
        "rage2-right.jpg",
        "rage2-left.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "left top"
      ]
    },
    "colors": {
      "frame": "rgba(249, 16, 143, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(54, 54, 54, 0.3)",
      "bookmark_text": "rgba(232, 231, 231, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.8)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}