Examine source code of Faster Pageload

{
  "manifest_version": 2,
  "name": "Faster Pageload",
  "version": "1.8.5",
  "author": "Simon Frey",
  "developer": {
    "name": "Simon Frey",
    "url": "https://simon-frey.eu/"
  },
  "description": "Load webpages faster by preloading subsequent pages via the instant.page script. Install the plugin and you will feel how your browser becomes faster.",
  "homepage_url": "https://github.com/simonfrey/faster-pageload-web-extensions",
  "icons": {
    "48": "icons/rocket.svg",
    "96": "icons/rocket.svg"
  },
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{73c0257e-a620-4c48-a2a8-2a9e8481a0d4}"
    }
  },
  "web_accessible_resources": [
    "static/*"
  ],
  "browser_action": {
    "default_icon": "icons/rocket.svg",
    "default_title": "Faster Pageload"
  },
  "permissions": [
    "storage",
    "webRequest",
    "<all_urls>",
    "webRequestBlocking"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/instant_page.min.js",
        "js/lazy_images.js"
      ]
    }
  ]
}