Examine source code of Tab Roator Or Switcher

{
  "manifest_version": 2,
  "name": "Tab Rotator",
  "version": "1.0",
  "description": "Automatically rotates through tabs.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-rotator@example.com",
      "strict_min_version": "60.0"
    }
  }
}