Examine source code of Request Maker

{
  "manifest_version": 2,
  "name": "Request Maker",
  "version": "1.3",
  "description": "Manually create and send HTTP requests with history support.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Request Maker",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{864d55dc-a919-499f-af7d-b0a298a780df}"
    }
  }
}