Examine source code of Old Genius (Song Page Switcher)

{
  "author": "mateimarica.dev@gmail.com",
  "manifest_version": 2,
  "name": "Old Genius (Song Page Switcher)",
  "short_name": "Old Genius",
  "version": "1.0.5.1",
  "description": "Switch between Genius's redesign and old song page, without it resetting when you click on another page.",
  "content_security_policy": "default-src 'self'; frame-ancestors 'none';",
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "matches": [
        "https://genius.com/*"
      ]
    }
  ],
  "background": {
    "page": "background/background.html",
    "persistent": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "https://genius.com/*"
  ],
  "web_accessible_resources": [
    "modules/regex.mjs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f925f4a8-58ae-4853-882c-b2053ddbaf24}"
    }
  }
}