Examine source code of duo-ext

{
  "name": "duo-ext",
  "version": "1.0.10",
  "description": "Extension for duo",
  "homepage_url": "https://github.com/falsidge/duo-ext",
  "manifest_version": 2,
  "minimum_chrome_version": "74",
  "__firefox__applications": {
    "gecko": {
      "id": "duo-ext@falsidge.github.io",
      "strict_min_version": "67.0"
    }
  },
  "browser_action": {
    "default_title": "Addon",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "assets/icons/favicon-16.png"
  },
  "permissions": [
    "https://*.duosecurity.com/*",
    "notifications",
    "storage",
    "webNavigation",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.duosecurity.com/*"
      ],
      "js": [
        "js/content.bundle.js"
      ],
      "run_at": "document_end",
      "match_about_blank": true,
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "duo-ext@falsidge.github.io"
    }
  }
}