Appearance and Customization
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Quote Colors & Collapse
Configure text and background colors of quotes in mail and news messages. From up addon version 3 (Thunderbird 91) you can collapse quotes.
Hide Local Folders Requires Restart
Removes the "Local Folders" entry from the folder pane.
Blinking Alert Requires Restart
Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.
To create your own collections, you must have a Mozilla Add-ons account.