In /usr/bin/sensible-browser line 5:
[ -n "$BROWSER" ] && [ "$(which $BROWSER || true)" = "$p" ] && BROWSER=
                                ^------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
[ -n "$BROWSER" ] && [ "$(which "$BROWSER" || true)" = "$p" ] && BROWSER=

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...