This extension adds an extra toolbar to Thunderbird. When you drag a mail folder to it, you get a fully customizable shortcut to that mail folder. This supports full drag and drop, like the corresponding folder in the folder tree - You can drag messages on it to move/copy them to the folder, and access the bookmarked folders through keyboard shortcuts.
This is handy when you have a large tree of folders for clients or projects, but use only a few of them at the same time.
The Category feature adds more usability by adding distinct areas to work in; this can make it easier to focus on a task that needs just a subset of the folders visible. There is also excellent integration with the Thunderbird tabbed interface provided since Tb version 3.
Freemium
Changelog
Fixed in page links for users with licenses! Before licensed users were directed to the top of a page instead of the correct location (such as the feature comparison list or current version info)
Improved speed of license validator for Thunderbird 91.2 and later.
Improved readability for menu items on (license-) restricted tabs.
https://addons.thunderbird.net/en-US/thunderbird/addon/quickfolders-tabbed-folders/