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CloseReview for Keep in Taskbar by Perette Barella
Rated 4 out of 5 stars
If the last window is closed, this add-on correctly transforms it to a minimize. However, if the last tab of the window is closed (done via hot-key), closing the window as a result, Thunderbird still exits. Platform: Linux Mint 18.3.
This review is for a previous version of the add-on (1.0).To create your own collections, you must have a Mozilla Add-ons account.