Examine source code of LoL Build Search

{
  "manifest_version": 3,
  "name": "LoL Build Search",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "1.1.1",
  "icons": {
    "16": "img/icon-16.png",
    "32": "img/icon-32.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "action": {
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6f9dfa6-fb0b-4235-ad18-0951c48e65e3}"
    }
  }
}