Examine source code of ClassCharts Improver

{
  "manifest_version": 3,
  "name": "ClassCharts Improver",
  "version": "5.6.4",
  "description": "Adds features to ClassCharts.",
  "browser_specific_settings": {
    "gecko": {
      "id": "hi.opticflowstudios@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.classcharts.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ]
}