Examine source code of Web Filter for Firefox

{
  "manifest_version": 3,
  "name": "SPIN Safe Browser - Web Filter",
  "version": "2.0",
  "description": "SPIN Safe Browsing: Web Filter for Firefox enables our leading web filtering technology in Firefox for a safer web surfing experience.",
  "permissions": [
    "storage",
    "webNavigation",
    "declarativeNetRequest"
  ],
  "background": {
    "scripts": [
      "libs/ExtPay.js",
      "background.js"
    ]
  },
  "host_permissions": [
    "*://*/"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://extensionpay.com/*"
      ],
      "js": [
        "libs/ExtPay.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_icon": {
      "19": "images/icon-19.png",
      "38": "images/icon-38.png"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefoxspinextension@nationaledtech.com",
      "strict_min_version": "113.0"
    }
  }
}