Examine source code of Offcloud.com

{
  "name": "Offcloud.com Extension",
  "description": "Allows you to take any link and fetch its data, either by directly downloading it, backing it up or transferring it to a third party",
  "version": "0.2.7resigned1",
  "manifest_version": 2,
  "homepage_url": "https://offcloud.com/",
  "background": {
    "page": "bg.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "lib/js/jquery-3.2.1.min.js",
        "lib/js/notie.js",
        "main.js"
      ],
      "css": [
        "lib/css/OpenSans.css",
        "lib/css/notie.css",
        "css/offcloud.css"
      ]
    }
  ],
  "permissions": [
    "*://*/*",
    "storage",
    "tabs",
    "contextMenus",
    "notifications",
    "clipboardWrite"
  ],
  "icons": {
    "16": "logo.png",
    "128": "logo.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "web_accessible_resources": [
    "lib/fonts/*.woff2"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-rtnEptCOUJvd5Q@jetpack"
    }
  }
}