Examine source code of Kananaskis

{
  "name": "Kananaskis",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "kananaskis-history-1920x1080.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 0)",
      "tab_background_text": "rgba(34, 77, 20, 1)",
      "toolbar": "rgba(37, 133, 66, 1)",
      "bookmark_text": "rgba(34, 77, 20, 1)",
      "toolbar_field": "rgba(99, 207, 196, 1)",
      "toolbar_field_text": "rgba(6, 110, 105, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{40235ee3-118e-47d6-9265-086f3a6e657a}"
    }
  }
}