Examine source code of SEO Tool Extension

{
  "name": "SEO Tool Extension",
  "description": "The SEO Tool Extension gives you quick access to many major SEO tools in one handy extension.",
  "homepage_url": "https://seotoolextension.com/",
  "manifest_version": 2,
  "version": "0.2.0",
  "author": "Peter Thaleikis",
  "browser_action": {
    "default_title": "SEO Tools",
    "default_popup": "popup.html",
    "default_icon": "assets/icon-128.png"
  },
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ]
}