Examine source code of GitHub Enhancer

{
  "manifest_version": 3,
  "name": "GitHub Enhancer",
  "version": "1.2",
  "description": "Github Pro",
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "https://github.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "github-date-enhancer@myst25"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "lib/browser-polyfill.min.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon48.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "popup.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}