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How can I set a custom icon for firefox running through firejail? (not only for the launcher but also for the running app itself)

rated 0 times [ 2] [ 0] / answers: 1 / hits: 476 / 3 Years ago, tue, july 20, 2021, 2:41:31

My specs: Ubuntu 20.04.3 with Gnome Shell on Wayland.
Notebook Acer Aspire 5 with AMD Ryzen 7 5700U.

For my work, I want to run Firefox through the sandboxing utility firejail.
I created a custom *.desktop file to launch the "firejailed" firefox and placed it in ~/local/share/applications.

In the *.desktop file, I specified a custom icon (the blue Firefox icon that is used for the nightly builds) and the custom launcher uses this blue icon. Ok, fine.

When I run the launcher, the "firejailed" Firefox starts and runs correctly but the icon that is displayed in the window overview and in the task bar (or dock) is the standard Firefox icon (orange/yellow) not the blue one I specified.

What I have to do so that the running "firejailed" Firefox is displayed in Gnome Shell with the blue icon?

Here is how my *.desktop file looks like:

[Desktop Entry]

Version=1.1

Type=Application

Name=Firefox Work

Comment=Web Browser configurated for Work

Icon=firefox-nightly

Exec=firejail --private=/home/nuri/.firejail-firefox/ firefox -no-remote

Actions=

Categories=Network;

StartupNotify=true