I'm using KDE Activities with different firefox profiles. So I need to launch firefox with "-p myprofile" and "--no-remote" options. I created a custom firefox launcher using "KDE Menu Editor" and pinned it to task manager. Click on on the new launcher causes the "normal" firefox to launch and the new one stays like it's not been launched. So if you stop activity and open it up, it will restore the "normal" firefox without any option. I've checked the behavior with custom Dolphin launcher and with Latte Dock. It works the same. Looks like It's not a bug, but a feature.
Maybe there is other way to get behavior I need to?

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KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
Kernel Version: 5.8.12-arch1-1