Examine source code of ZipWeb

{
  "manifest_version": 2,
  "name": "Zip WebApp (Beta)",
  "short_name": "Zip HTML5 Webapp",
  "description": "All client-side solution for Browser Chrome to create zip archive and extract zip and rar archive files with API HTML5 file system",
  "version": "1.5.1resigned1",
  "minimum_chrome_version": "38",
  "icons": {
    "16": "assets/icon_16.png",
    "128": "assets/icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "jid1-AqQG4Beii8FfZQ@jetpack",
      "strict_min_version": "50.0"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "downloads",
    "<all_urls>",
    "*://*/*/",
    "contextMenus"
  ],
  "browser_action": {
    "default_icon": {
      "19": "assets/icon_16.png",
      "38": "assets/icon_128.png"
    }
  },
  "sandbox": {
    "pages": [
      "data/index.html"
    ]
  },
  "offline_enabled": true,
  "content_scripts": [
    {
      "js": [
        "data/js/vendor/jszip.js",
        "data/js/vendor/FileSaver.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; child-src 'self' data:; default-src 'self'; media-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; font-src 'self'; connect-src 'self' data:;",
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}