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Thunderbird Add-ons

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] Allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (based on your settings).

[Thunderbird Add-on] Configure text and background colors of quotes in mail and news messages.

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

Thunderbird extension to copy any text selected in an email immediately