How to improve Signal Desktop’s usability under Firejail

If you use Firejail to run Signal Desktop in a sandboxed environment on Linux, you will likely be surprised by the fact that a new application instance is opened every time you execute the firejail signal-desktop command. Attempting to open a second instance of Signal Deskop should simply cause the existing one to be activated instead, but Firejail breaks this default behavior.

On top of that, if you use the –use-tray-icon parameter to have Signal Desktop place an icon on your desktop environment’s icon tray, the icon may not only be displayed incorrectly, but each new opened instance will place an additional (incorrect) icon there as well, making things even worse.

Addressing these issues is fortunately easy. All you need to do is create a Firejail profile file named signal-desktop.profile inside the ~/.config/firejail/ directory containing the following:

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