Examine source code of Kura - Link Manager

{
  "manifest_version": 3,
  "name": "Kura - Link Manager",
  "version": "1.4.2",
  "description": "A beautiful new tab page to manage your links.",
  "icons": {
    "48": "k-48.png",
    "96": "k-96.png",
    "128": "k-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "bookmarks",
    "topSites",
    "downloads",
    "contextMenus"
  ],
  "host_permissions": [
    "https://openrouter.ai/*",
    "https://api.pexels.com/*",
    "https://videos.pexels.com/*",
    "https://images.pexels.com/*",
    "http://ip-api.com/*",
    "https://images.unsplash.com/*",
    "https://unsplash.com/*",
    "https://api.open-meteo.com/*",
    "https://geocoding-api.open-meteo.com/*",
    "https://zenquotes.io/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Save to Kura",
    "default_icon": "k-48.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkmanager@florian.me",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; media-src 'self' https://videos.pexels.com"
  }
}