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how can i check the shortcut (default) ?
e.g. [browser : www] does not work but [browser : firefox]  does ; btw why
have i 2 versions : firefox & firefox-esr ?
& crtl+alt+t does not start the terminal but [run command prompt : alt+f2]

- do you know a command or a soft doing the job just for testing the
validity of these debian settings (default) ?