Examine source code of grey gunners theme

{
  "name": "grey gunners theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2023-05-06 at 17.37.30.png"
    },
    "colors": {
      "frame": "rgba(202, 204, 209, 1)",
      "tab_background_text": "rgba(133, 133, 133, 1)",
      "toolbar": "rgba(235, 235, 235, 0)",
      "bookmark_text": "rgba(122, 122, 122, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgba(130, 130, 130, 1)",
      "tab_line": "rgba(125, 125, 125, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{45483388-ea10-4693-939a-b842c8d55229}"
    }
  }
}