Examine source code of Tab Deduper

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.5.0",
  "description": "__MSG_extensionDescription__",
  "developer": {
    "name": "nosoop",
    "url": "https://github.com/nosoop/tab-deduper"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg",
    "256": "icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "tabs",
    "cookies",
    "notifications",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{28d03e32-9c43-4a90-b89d-b42abf9e3c8f}"
    }
  },
  "default_locale": "en"
}