Examine source code of Bulk URL Opener

{
  "manifest_version": 2,
  "name": "Bulk URL Opener",
  "version": "1.3",
  "description": "Open multiple URLs at once with various options.",
  "permissions": [
    "tabs",
    "storage",
    "clipboardRead",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "bulk-url-opener@example.com",
      "strict_min_version": "78.0"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}