Examine source code of Blocked Websites

{
  "manifest_version": 2,
  "name": "Blocked Websites",
  "version": "1.5",
  "description": "Save and manage a list of blocked websites.",
  "permissions": [
    "tabs",
    "storage",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "block-website@mcavdar.com",
      "strict_min_version": "126.0"
    }
  },
  "options_page": "options.html",
  "browser_action": {
    "default_popup": "options.html"
  }
}