Examine source code of Pixiv Infinite Scroll

{
  "manifest_version": 2,
  "name": "Pixiv Infinite Scroll",
  "description": "__MSG_description__",
  "version": "2.2.3",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "getFetchRequest.js",
    "content-scripts/content.css"
  ],
  "browser_action": {
    "default_title": "Pixiv Infinite Scroll",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.pixiv.net/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "https://www.pixiv.net/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/main-world.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d049cbc8-6a44-4efe-865d-4503274e45a5}"
    }
  }
}