Gmail Notifier Dev Edition is a Firefox extension designed to provide users with a flexible email notification system. With this tool, users can set specific queries to receive notifications for incoming emails without needing to enter credentials, as it utilizes logged-in accounts. The extension features a user-friendly popup view that displays all emails matching the defined queries, along with common actions such as marking emails as read, reporting spam, archiving, and deleting directly from the notification interface.

In addition to its notification capabilities, the extension supports desktop notifications and customizable sound alerts, enhancing user experience. It also adheres to a content-security policy to safeguard against loading remote resources. Although currently in an experimental stage, it promises compatibility with the Gmail API and email delegation for managing multiple accounts. Users are encouraged to provide feedback for future improvements.