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Windows 10: Mozilla Trunderbird: 4t Tray Minimizer actions don't work for its titlebar buttons

Problem description

The issue happens because Trunderbird uses its own titlebar buttons instead of using the standard windows titlebar buttons.

Solution

Force Trunderbird to use the standard titlebar buttons:

1. To access the config editor, go to Tools > Options, select the Advanced panel, select the General tab, and click Config Editor
2. Click I'll be careful, I promise! button if a warning page appears
3. In the Search field, enter titlebar
4. Double click mail.tabs.drawInTitlebar to set value to false. Now Trunderbird will use the standard titlebar buttons


It can be an alternative solution

We are considering a new feature for next versions: actions for clicking into user-defined rectangles in favorite applications.

You can vote it in our wish list.