Examine source code of Bookmarkify

{
  "manifest_version" : 3 ,
  "name" : "Bookmarkify",
  "description" : "Bookmark anywhere on a web page",
  "version" : "1.0.7",
  "icons" : {
    "16" : "img/icon_16.png",
    "48" : "img/icon_48.png",
    "128" : "img/icon_128.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "./js/content.js" 
      ],
      "css" : [
        "./css/style.css" 
      ]
    }
  ],
  "action" : {
    "default_icon" : "img/icon_16.png",
    "default_popup" : "popup.html"
  },
  "permissions" : [
    "storage" 
  ],
  "background" : {
    "scripts" : [
      "js/background-script.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2729221-0a67-47cd-922c-40bf79765e9b}"
    }
  }
}