Examine source code of Asset Store Price Tracker

{
  "manifest_version": 3,
  "name": "Asset Store Price Tracker",
  "version": "2.2.2",
  "description": "This extension lets you view pricing history for asset pricing on both Unity's and Unreal's webstores.",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "96": "icons/icon_96.png",
    "128": "icons/icon_128.png",
    "256": "icons/icon_256.png"
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Asset Store Price Tracker",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://assetstore.unity.com/packages/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-script-unity.js"
      ]
    },
    {
      "matches": [
        "*://www.unrealengine.com/marketplace/*/product/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-script-unreal.js"
      ]
    }
  ],
  "host_permissions": [
    "*://asset-store-price-tracker.despair.services/*",
    "*://assetstore.unity.com/packages/*",
    "*://www.unrealengine.com/marketplace/*/product/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "despairservices@gmail.com"
    }
  }
}