Examine source code of Bulk URL Opener

{
  "name": "Bulk URL Opener",
  "version": "1.0.0",
  "manifest_version": 2,
  "description": "Opens a list of URLs",
  "homepage_url": "https://github.com/dmtrbrl/bulk-url-opener",
  "icons": {
    "16": "/icons/icon-16.png",
    "48": "/icons/icon-48.png",
    "128": "/icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": "/icons/icon-32.png",
    "default_popup": "app.html"
  },
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9de35092-9f85-40c8-9566-49336a3a7c5c}"
    }
  }
}