Examine source code of Find All Numbers

{
  "manifest_version": 2,
  "name": "Find All Numbers",
  "version": "1.0",
  "description": "Extracts all valid 10- or 11-digit phone numbers from the given text.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "FN-lighter-blue-16x16.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c1ab9122-449b-41d3-b72b-6b3eb70f894b}"
    }
  }
}