Rated 5 out of 5 stars

le ChrisGn ar Aib. 24, 2017 ·

This is an absolutely must have brilliant add-on. Unfortunately since updating to the latest version of Thunderbird (52.0.1), the Arrows to control which Folder Pane is viewed have disappeared.

Léirmheas ar leagan níos sine den bhreiseán seo (1.11). 

le Jonathan Kamens (Forbróir) ar Aib. 25, 2017 ·

UPDATE: The arrows are back in this beta release:

https://addons.mozilla.org/en-US/thunderbird/addon/folder-pane-view-switcher/versions/1.12beta2

Give it a try!

Original response:

Please read "About this Add-on" at https://addons.mozilla.org/en-US/thunderbird/addon/folder-pane-view-switcher/.