Examine source code of Bookmark: Keyboard centric, Card layout and Sync

{
  "manifest_version": 2,
  "name": "Bookmark: Keyboard centric, Card layout sync",
  "description": "Open a snappy bookmark gallery everywhere. Keyboard driven with powerful search. Card layouts and HD icons. Sync across browsers.",
  "version": "1.4.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "bookmarksInfo",
          "personallyIdentifyingInfo"
        ]
      },
      "id": "{d7b2cae4-1317-4a19-8a85-cddfc9f1b180}"
    }
  },
  "permissions": [
    "activeTab",
    "alarms",
    "bookmarks",
    "favicon",
    "storage",
    "https://icon.souple.dev/*",
    "http://*/*",
    "https://*/*"
  ],
  "web_accessible_resources": [
    "_favicon/*"
  ],
  "commands": {
    "open-bookmark-gallery": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Open bookmark gallery"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; img-src 'self' https://icon.souple.dev data: blob:; connect-src 'self' http://*:* https://* ws://localhost:* ws://127.0.0.1:* https://icon.souple.dev https://o4511342694432768.ingest.de.sentry.io;",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_action": {
    "default_title": "Bookmark Everywhere",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}