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I receive mails via Thunderbird (with extensions FireTray and GNOME Integration) and want to display the "New mail notification" a bit longer.

How can I increase the length of time notifications are displayed in Gnome 3.4.2?

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up vote 1 down vote accepted

By default, NOTIFICATION_TIMEOUT is set to 4 seconds in gnome-shell ui files, namely

/usr/share/gnome-shell/js/ui/messageTray.js

so changing the timeout is only a matter of editing that file, specifically this line:

const NOTIFICATION_TIMEOUT = 4;

and replacing the default value (4) with whatever suits you.
Restart shell with Alt+F2 , r for the changes to take effect.

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