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Autohide Folders panel 0.6 Requires Restart
Extension automatically hides the folders panel. The folder panel can be seen by placing the mouse pointer in the left corner of the window or by Accel-1 shortkey.
About this Add-on
* Add the parameter for change of width of an active area;
* Save the visibility state between restarts.
This add-on is not compatible with your version of Thunderbird because of the following: