Examine source code of BetterACF

{
  "description": "Dark mode & Improvements for authors.curseforge.com",
  "manifest_version": 2,
  "name": "BetterACF",
  "version": "1.0",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/borderify",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://authors.curseforge.com/*"
      ],
      "js": [
        "borderify.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{797eca70-7e8d-4926-aaf1-2dbf6a0b92ff}"
    }
  }
}