Add entry to qube manager menu

How can you add entries to the qube manager menu?
Instead of “run command in qube”, I would like to have an entry for the specific command.
Like running Firefox, terminal etc. (instead of running it via taskbar).

You need to modify the Qube-Manager code and add the modification you want.
https://github.com/QubesOS/qubes-manager

The files are located here:
/usr/lib/python3.8/site-packages/qubesmanager/

See the function def action_run_command_in_vm_triggered in qube_manager.py
to see how it is implemented.

Notice that you will need some knowledges with Qt and python.