Examine source code of GH PR cleaner

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "gh-pr-cleaner@velocity.hcl"
    }
  },
  "name": "GH PR cleaner",
  "version": "1.4",
  "description": "Cleanup GH PR page",
  "content_scripts": [
    {
      "js": [
        "github01.hclpnp.js"
      ],
      "matches": [
        "https://github01.hclpnp.com/*"
      ]
    }
  ]
}