Examine source code of GitHub: My Profile Link

{
  "name": "GitHub: My Profile Link",
  "version": "3.0.1",
  "author": "Helton Ricardo",
  "description": "A browser extension that adds a convenient link to your GitHub profile in the existing navigation bar.",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "helton.contato@proton.me",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png",
    "256": "assets/icons/icon256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/img/my-profile.svg"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ]
}