Examine source code of Share Pull Request

{
  "manifest_version": 3,
  "name": "Share Pull Request",
  "version": "1.3",
  "description": "Adds a button to GitHub PR pages to copy PR details.",
  "permissions": [
    "clipboardWrite"
  ],
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/*/pull/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "github-copy-pr@example.com",
      "strict_min_version": "109.0"
    }
  }
}