Examine source code of RobberRev

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "RobberRev",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(54, 54, 59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(25, 0, 72)",
      "tab_background_text": "rgb(186, 188, 232)",
      "toolbar_field": "rgb(3, 3, 3)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 138, 0)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(215, 226, 239)",
      "ntp_background": "rgb(42, 25, 77)",
      "tab_loading": "rgb(255, 138, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ff5a547-15dc-4d6f-a85c-f94d9ea206e1}"
    }
  }
}