Appearance and Customization
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Group Favorite Folders
An extension for Thunderbird 115+ (Supernova) that groups and sorts favorites folders in the compact view.
Custom Subject Column
Add a column to the message list that replaces the subject with a regular expression
Date Time Formatter
Shows relative date-time in the column.
Note: you need to click "Select columns to display" and then -> "Relative Date/Time"
To create your own collections, you must have a Mozilla Add-ons account.