Zimbra Mail Notifier, by David GUEHENNEC, is a Firefox extension that keeps Zimbra Webmail users informed without an open webmail tab. It monitors Zimbra mailboxes for unread messages and delivers system notifications in real time while also surfacing upcoming calendar events and tasks. Key elements include a toolbar unread counter, multi-account handling, local AES password encryption, and 15-language support. It targets professionals and students who need lightweight, browser-centered mailbox and schedule awareness.

Monitors mail, calendar and tasks without keeping webmail open

The extension polls configured Zimbra servers and notifies you when new messages arrive, avoiding a permanently open webmail tab. It puts an unread message counter on the Firefox toolbar and issues system notifications for incoming mail. Calendar appointments and a snapshot of ongoing tasks are also accessible from the toolbar, so users can glance at schedule items without loading the full Zimbra interface.

• Real-time mail alerts
• Toolbar unread counter
• Calendar and tasks preview

Stores credentials locally with AES encryption and open-source transparency

Credentials are kept in local browser storage and protected with AES encryption, so passwords do not leave the device for third-party storage. The extension is open source under MPL, GPL, and LGPL licenses, allowing administrators and auditors to inspect its behavior. That design choice reduces reliance on external telemetry and supports deployment where visible source code is a requirement.

Notification controls depend on explicit browser and system permissions

Notification delivery requires both the extension's settings and the device's notification permissions to be enabled, a detail called out in the support notes. Users can enable an 'inbox only' option to exclude subfolders from unread counts, which helps manage noisy folders. If alerts do not appear, confirm Firefox and operating system notification permissions and the extension's notification toggles.

Extends across desktop, Android, and Chromium-based browsers with multi-account support

The extension runs on Firefox for desktop and Android and is compatible with Chromium-based browsers, so it reaches multiple device types. It supports several Zimbra accounts in one installation, which suits people who manage multiple mailboxes from the same browser. Language support for 15 locales, including English, French, German, and Spanish, enables configuration in several common languages.

A practical, privacy-aware option for browser-centred Zimbra monitoring

The extension suits Zimbra users who want compact, privacy-aware visibility of inbox activity from the browser, and it favors administrators who value inspectable open-source code. One consideration: notification delivery hinges on correct browser and operating system permissions, which can require manual configuration. It balances a small browser footprint with the expectation that users confirm notification permissions and folder scope before relying on alerts.