msofficewebapp 1.3
by Thomas Bandl
Adds browser action icon to toolbar to open MS Office Cloud. See https://thunderbird-essentials.thomas-bandl.de/wordpress/2020/10/04/microsoft-office-button/
This add-on requires the following add-ons to work properly:
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* Open a selected message in a tab by a toolbar button
* Open a message in a tab by double-clicking its header view (disabled by default)
* Hide Lightning's Today Pane on opening a tab870 users