Examine source code of Jack o' Lantern Halloween

{
  "name": "Jack o' Lantern Halloween",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "fiery evil pumpkin.png"
    },
    "colors": {
      "frame": "rgba(34, 36, 43, 0.92)",
      "tab_background_text": "rgba(46, 166, 209, 1)",
      "toolbar": "rgba(11, 13, 13, 0.04)",
      "bookmark_text": "rgba(46, 166, 209, 1)",
      "toolbar_field": "rgba(38, 32, 32, 0.48)",
      "toolbar_field_text": "rgba(46, 166, 209, 1)",
      "tab_line": "rgba(232, 101, 30, 0.69)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{636c52d3-6b52-46d7-b113-9bf51a90e4e6}"
    }
  }
}