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Extra Folder Columns 1.1.5
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.
About this Add-on
See https://support.mozilla.org/en-US/kb/new-thunderbird-38#w_expanded-folder-pane-columns for changes in Thunderbird 38, as this functionality is now in core.