Examine source code of Salesforce Lightningaca

{
  "manifest_version": 2,
  "version": "1.7.4",
  "name": "Salesforce Lightning Queue Refresher",
  "description": "Will automatically refresh both the 'table' view && the 'side bar' view.",
  "author": "Jacob Storer",
  "content_scripts": [
    {
      "matches": [
        "*://*.lightning.force.com/*"
      ],
      "js": [
        "refresh.js"
      ],
      "css": [
        "widget.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdfaca05-78f9-4924-8ced-5d6b198d1528}"
    }
  }
}