I need to activate the open window.

[iyagicom]

For example,
If chromium-browser is enabled, Customcorner should make the active window visible.
If chromium-browser is disabled, Customcorner should open a new one.

These features are essential.
Please make it.

[janxyz]

This is possible with a command and wmctrl:

sh -c 'wmctrl -xa chromium || chromium'

You might need to change the last chromium to chromium-browser depending on your distribution.

[iyagicom]

I installed wmctrl and it worked very well.
Thank you for the tears.