Icon of Extra Folder Columns

Extra Folder Columns 1.1.5 Bắt buộc khởi động lại

bởi Joey Minta, Thunderbird Development Team

This extension is for those TB3 users who want the multiple-columns view that TB2 allowed

IMPORTANT: If you are using Thunderbird 38 or later, uninstall this addon. The functionality is in core now.