Examine source code of Catalog Web Clipper

{
  "manifest_version": 2,
  "name": "Catalog Web Clipper",
  "version": "0.3.2",
  "description": "Save web clippings to Catalog app",
  "icons": {
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "browser_action": {
    "default_icon": "icons/32.png",
    "default_title": "Catalog Web Clipper"
  },
  "homepage_url": "https://github.com/amitnovick/catalog",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "permissions": [
    "activeTab",
    "tabs",
    "http://*/",
    "https://*/",
    "<all_urls>",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "lib/toast.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "background.js"
    ]
  }
}