Benvingut a complements de Thunderbird.
Add extra features and styles to make Thunderbird your own.Tanca
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.
Quant al complement
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.