Examine source code of Angular Version Detector

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "angular-detector@dimen311"
    }
  },
  "name": "Angular Version Detector",
  "version": "1.0.1",
  "homepage_url": "https://github.com/username/angular-detector",
  "author": "dimen311",
  "description": "Detects Angular framework and displays version information",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "styles.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}