Examine source code of Video Siphon

{
  "manifest_version": 2,
  "name": "videoSiphon",
  "short_name": "videoSiphon",
  "version": "1.0.8",
  "description": "This Google Chrome extension allows you to download Vimeo, Wistia and Facebook videos for better offline viewing",
  "background": {
    "scripts": [
      "/assets/js/jquery-3.4.1.min.js",
      "config.js",
      "assets/js/background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "128": "icons/icon128.png"
    },
    "default_title": "VideoSiphon",
    "default_popup": "/index.html"
  },
  "content_security_policy": "script-src 'self' https://cdnjs.cloudflare.com; object-src 'self'",
  "permissions": [
    "tabs",
    "storage",
    "downloads",
    "cookies",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "assets/js/jquery-3.4.1.min.js",
        "assets/js/content.js"
      ],
      "all_frames": true,
      "css": [
        "/assets/css/content.css"
      ]
    }
  ]
}