[MinimizeToTray] "on/off line" selection mode / minimize to tray

[diorser]

Hello,

I would like to know how to add "on/off line" selection mode in the 
right click menu below:

ThunderbirdmenuSmall.png

The goal is to avoid having to reopen and close again TB window (few 
seconds)  to just change this mode.

Thanks.

Diorser.
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