Examine source code of Popupblocker

{
  "manifest_version": 2,
  "name": "Popupblocker",
  "author": "Joofthan",
  "version": "2.3.2",
  "description": "This add-on can block every popup. Many websites open new windows with ads, when you try to mark text or click something. This add-on will block these and show a really small notification.",
  "permissions": [
    "tabs",
    "notifications",
    "storage"
  ],
  "options_ui": {
    "page": "blackwhitelist.html",
    "browser_style": true
  },
  "icons": {
    "38": "icons/icon-38.png",
    "40": "icons/icon-40.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_icon": {
      "38": "icons/icon-38-dt.png",
      "40": "icons/icon-40.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Popupblocker",
    "default_popup": "popups/disabled-temp.html"
  },
  "background": {
    "scripts": [
      "scripts/script.js"
    ],
    "type": "module"
  },
  "applications": {
    "gecko": {
      "id": "{05ce2135-ced2-4272-97b0-c00c00a93355}",
      "strict_min_version": "112.0"
    }
  }
}