Examine source code of Salesforce List View Auto Refresh

{
  "manifest_version": 3,
  "name": "Salesforce List View Auto Refresh",
  "version": "1.0",
  "description": "Automatically refresh Salesforce list views at custom intervals",
  "author": "Maninder Singh, https://www.sfdcproducthunt.com/",
  "homepage_url": "https://www.sfdcproducthunt.com/",
  "browser_specific_settings": {
    "gecko": {
      "id": "@sflistview-refresh.maninder-s",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.salesforce.com/*",
        "https://*.force.com/*",
        "https://*.lightning.force.com/*",
        "https://*.cloudforce.com/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Salesforce List View Auto Refresh"
  },
  "options_page": "options.html",
  "web_accessible_resources": [
    {
      "resources": [
        "welcome.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}