Examine source code of Mushrooms and Squirrel

{
  "name": "Mushrooms and Squirrel",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "MushroomandSquirrelH.jpg"
    },
    "colors": {
      "frame": "rgba(51, 4, 2, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(51, 5, 2, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(51, 5, 2, 0.13)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65547220-1b49-429f-94aa-7df8bda96408}"
    }
  }
}