Examine source code of Dark Mushroom Forest

{
  "name": "Dark Forest",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Dark Forest.png"
    },
    "colors": {
      "frame": "rgba(6, 51, 23, 1)",
      "tab_background_text": "rgba(107, 0, 0, 1)",
      "toolbar": "rgba(13, 26, 15, 1)",
      "bookmark_text": "rgba(128, 46, 46, 1)",
      "toolbar_field": "rgba(28, 61, 33, 1)",
      "toolbar_field_text": "rgba(128, 46, 46, 1)",
      "tab_line": "rgba(54, 89, 44, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f790208c-66a4-4aa3-b3af-4dd528086add}"
    }
  }
}