`open` command is not working

I do have a problem with the open command. It works fine when opening the finder via open ., however I can't seem to open Firefox:

$ open test.html 
[1]    78952 trace trap  open test.htm

atom-cli also gives me problems (the script /usr/local/bin/atom is a bit more elaborate, but it essentially boils down to open -a "$ATOM_PATH/$ATOM_APP_NAME" -n --args --executed-from="$(pwd)" --pid=$$ --path-environment="$PATH" "$@"):

$ atom .
/usr/local/bin/atom: line 115: 79282 Trace/BPT trap: 5       open -a "$ATOM_PATH/$ATOM_APP_NAME" -n --args --executed-from="$(pwd)" --pid=$$ --path-environment="$PATH" "$@"

Any idea how to debug or fix this?

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