Examine source code of OpenSea auto upload

{
  "manifest_version": 2,
  "name": "OpenSea auto upload",
  "version": "1.0",
  "description": "This extension will automatically upload multiple NFTs into opensea collections from a .csv or pattern file. They will create them if 100 people wish to use this extension here: https://discord.gg/ff2U2MVx",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://opensea.io/*"
      ],
      "js": [
        "upload.js"
      ]
    }
  ]
}