Examine source code of HubSpot Cache Buster

{
  "manifest_version": 2,
  "name": "HubSpot Cache Buster",
  "version": "1.1",
  "description": "Reloads the tab with a random hsCacheBuster query parameter to bypass cache.",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon.svg"
    },
    "default_title": "Bust Cache with hsCacheBuster"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e469e8a0-faa7-4541-942b-41db11a59b07}"
    }
  }
}