Examine source code of Reload Tab Extension

{
  "manifest_version": 2,
  "name": "Reload Tab Extension",
  "version": "2.3",
  "description": "Reloads the current SharePoint tab",
  "permissions": [
    "tabs",
    "storage",
    "*://*.sharepoint.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Reload Tab",
    "default_icon": {
      "48": "icon1.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon1.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2bc4881b-0b5f-4bd4-828a-d7101460e2b4}"
    }
  }
}