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Thunderbird Extension

This Thunderbird (68+) Add On makes it easy to send large attachments: It uploads the files to Strato's Hidrive service and inserts download links into the message

Notify on This Folder Not That Folder: A Thunderbird Extension allowing you to choose which accounts and folders to get notifications for. Also allows setting different sounds for each account.

Thunderbird Add-on to open Google chat in a new tab - https://addons.thunderbird.net/en-US/thunderbird/addon/google-chat-tab/

A Thunderbird Extension/ Add-on which automatically sorts all incoming Mails from GitLab.