Examine source code of File Links Opener

{
  "manifest_version": 2,
  "name": "File Links Opener",
  "description": "__MSG_extensionDescription__",
  "version": "0.7",
  "author": "Dmitry Unruh",
  "icons": {
    "32": "img/32.png",
    "48": "img/48.png",
    "64": "img/64.png",
    "128": "img/128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "default_locale": "en",
  "permissions": [
    "nativeMessaging",
    "notifications",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "file_links_opener@example.org",
      "strict_min_version": "57.0"
    }
  }
}