Data is synced from the Chrome Web Store. View the official store page for the most current information.
Key features:
After installation, request an API token at the options page to get real-time notifications of new messages. Alternatively, only set a StackExchange ID without granting the token. (not recommended, because this token is needed for getting the unread count at any given time).
Permissions warnings:
Also available as a Firefox Add-on: https://addons.mozilla.org/en-US/firefox/addon/real-time-desktop-notificat/
Support and information: https://stackapps.com/q/3780/9699
Privacy policy: You may specify a StackExchange ID (and optionally use StackExchange's mechanism to grant an StackExchange API token) to enable the extension to function. This data is stored locally only, and only used with the StackExchange API to receive notifications for inbox messages. No other data is collected, and the data is not used for any other purpose.