Examine source code of Chark

{
  "name": "Chark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Group 1.png"
    },
    "colors": {
      "frame": "rgba(36, 36, 36, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(36, 36, 36, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(36, 36, 36, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(36, 36, 36, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c94f598-c69b-496c-9f27-f415bdcb9f9c}"
    }
  }
}