Examine source code of MarkSyncr

{
  "manifest_version": 3,
  "name": "MarkSyncr",
  "version": "0.8.37",
  "description": "Sync your bookmarks across browsers using GitHub, Dropbox, Google Drive, or MarkSyncr Cloud",
  "icons": {
    "16": "icons/favicon-16.png",
    "32": "icons/favicon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/favicon-16.png",
      "32": "icons/favicon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "MarkSyncr"
  },
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "permissions": [
    "bookmarks",
    "storage",
    "alarms",
    "identity",
    "declarativeNetRequest",
    "activeTab"
  ],
  "optional_permissions": [
    "tabs"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ads",
        "enabled": true,
        "path": "rules/ads.json"
      },
      {
        "id": "privacy",
        "enabled": true,
        "path": "rules/privacy.json"
      }
    ]
  },
  "host_permissions": [
    "https://api.github.com/*",
    "https://api.dropboxapi.com/*",
    "https://content.dropboxapi.com/*",
    "https://www.googleapis.com/*",
    "https://*.supabase.co/*",
    "https://marksyncr.com/*",
    "http://localhost:3000/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "marksyncr@marksyncr.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}