Examine source code of DFCraft - Deep Focus Timer

{
  "manifest_version": 2,
  "name": "DFCraft - Deep Focus Timer",
  "version": "2.1.0",
  "description": "Craft your focus with Pomodoro timer, todos, and distraction blocking",
  "icons": {
    "16": "icons/CARACTER-16.png",
    "48": "icons/CARACTER-48.png",
    "128": "icons/CARACTER-128.png"
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "DFCraft"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms",
    "activeTab",
    "tabs"
  ],
  "web_accessible_resources": [
    "staticPages/blocked.html",
    "sounds/*.wav",
    "sounds/*.mp3",
    "offscreen.html",
    "offscreen.js",
    "fonts/*.ttf"
  ],
  "content_security_policy": "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data: https://raw.githubusercontent.com https://objects.githubusercontent.com; media-src 'self' https://github.com https://objects.githubusercontent.com https://release-assets.githubusercontent.com blob:; font-src 'self' https://fonts.gstatic.com; connect-src 'self' https://cdn.jsdelivr.net https://raw.githubusercontent.com https://github.com https://objects.githubusercontent.com https://release-assets.githubusercontent.com",
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "notyet@fackmail.com",
      "strict_min_version": "109.0"
    }
  }
}