Examine source code of Bing Search Clear

{
  "manifest_version": 2,
  "name": "Bing Search Clear",
  "version": "1.1",
  "description": "Clears the Bing search bar",
  "icons": {
    "48": "icons/my_icon.jpg",
    "96": "icons/my_icon.jpg"
  },
  "background": {
    "scripts": [
      "clear.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clear-yxgstudio@outlook.com"
    }
  },
  "permissions": [
    "*://*.bing.com/search*",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}