Examine source code of FocusGuard+

{
  "manifest_version": 2,
  "name": "FocusGuard",
  "version": "5.0",
  "description": "Block doomscrolling with advanced controls",
  "browser_specific_settings": {
    "gecko": {
      "id": "vistahista1@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "scripting",
    "activeTab",
    "*://*/*"
  ],
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "DoomScroll Blocker"
  },
  "options_page": "options/options.html",
  "web_accessible_resources": [
    "lib/chart.js"
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_security_policy": "script-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com; object-src 'self'"
}