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由 ChrisGn 发表于 April 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.

这个评论是针对附加组件的一个早期版本的（1.11）。 

作者 Jonathan Kamens (开发者) 日期 April 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/.