Examine source code of Social Blocker

{
  "manifest_version": 3,
  "name": "Social Blocker",
  "version": "1.4.1",
  "license": "ISC",
  "description": "Define your time windows with allowed time for social media. Blocks any social network (or other websites) for all other times during the day.",
  "browser_specific_settings": {
    "gecko": {
      "id": "social-blocker@honzik84.cz"
    }
  },
  "permissions": [
    "activeTab",
    "alarms",
    "scripting",
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "https://*.facebook.com/*",
    "https://*.instagram.com/*",
    "https://*.tiktok.com/*",
    "https://*.x.com/*",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "pages/options.html",
    "browser_style": false
  },
  "icons": {
    "256": "icons/social-blocker-256.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "pages/blocked.html"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ]
}