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The Buttons! software enables you to easily incorporate custom buttons into your Thunderbird toolbar, like the Next button, for quick and efficient navigation.

Remove junk mail easily with Delete Junk Context Menu extension, simplifying your inbox management.

SMTP Username is a tool that lets users view their SMTP server's username (if it exists) alongside it as an extension.

Folderpane Tools is a software extension that can easily customize the folder pane to improve usability.

No New Window on Double Click is a Thunderbird extension that disables the program's ability to launch a new primary window when double-clicking on items. This helps prevent clutter and improves user experience.