Examine source code of RdGr

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "RdGr",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-020-48c286b34e53380d46803c2e5603a5b2.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(130, 0, 2)",
      "toolbar_text": "rgb(222, 222, 222)",
      "frame": "rgb(109, 111, 112)",
      "tab_background_text": "rgb(222, 222, 222)",
      "toolbar_field": "rgb(222, 222, 222)",
      "toolbar_field_text": "rgb(130, 0, 2)",
      "tab_line": "rgb(109, 111, 112)",
      "popup": "rgb(222, 222, 222)",
      "popup_text": "rgb(130, 0, 2)",
      "tab_loading": "rgb(109, 111, 112)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{225a3545-7849-47f4-a6a2-d6d86c41f392}"
    }
  }
}