Examine source code of Folder Opener

{
  "manifest_version": 2,
  "name": "Folder Opener",
  "version": "1.3",
  "description": "Opens up folder link",
  "icons": {
    "48": "icons/folder-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "folder-opener@tapanko.com"
    }
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "menu/menu.html",
    "default_icon": {
      "48": "icons/folder-48.png"
    }
  },
  "options_ui": {
    "page": "menu/options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "folder-opener.js"
      ]
    }
  ],
  "permissions": [
    "nativeMessaging",
    "notifications"
  ]
}