I don't understand, either.
The output of "set -x":
$ iceweasel
+ [ ]
+ MOZ_DIST_BIN=/usr/lib/iceweasel
+ MOZ_PROGRAM=/usr/lib/iceweasel/firefox-bin
+ RUNTIME_ICEWEASEL_DSP=
+ [ ]
+ [ -f /etc/iceweasel/iceweaselrc ]
+ . /etc/iceweasel/iceweaselrc
+ ICEWEASEL_DSP=none
+ [ -f /home/jonny/.mozilla/firefox/rc ]
+ [ -f /home/jonny/.mozilla-firefoxrc ]
+ [ ]
+ [ -z none ]
+ export MOZ_DISABLE_PANGO
+ [ none = auto ]
+ [ none = none ]
+ ICEWEASEL_DSP=
+
EXTENT_LD_LIB_PATH=/usr/lib/iceweasel:/usr/lib/iceweasel/plugins:/usr/lib/mozilla-firefox/plugins
+ [ ]
+
LD_LIBRARY_PATH=/usr/lib/iceweasel:/usr/lib/iceweasel/plugins:/usr/lib/mozilla-firefox/plugins
+ export LD_LIBRARY_PATH
+ EXTENT_MOZ_PLUGIN_PATH=/usr/lib/mozilla-firefox/plugins
+ [ ]
+ MOZ_PLUGIN_PATH=/usr/lib/mozilla-firefox/plugins
+ export MOZ_PLUGIN_PATH
+ APPLICATION_ID=firefox
+ VERBOSE=
+ DEBUG=0
+ DEBUGGER=
+ first=1
+ opt=
+ set -- -a firefox
+ [ 2 -ne 0 ]
+ shift
+ OPTIONS=firefox
+ [ 0 -eq 1 ]
+ echo_vars ICEWEASEL_DSP APPLICATION_ID CMDLINE_DISPLAY DISPLAY OPTIONS DEBUG
DEBUGGER MOZ_DISABLE_PANGO MOZ_NO_REMOTE
+ [ ]
+ type
+ exec_verbose /usr/lib/iceweasel/firefox-bin firefox
+ verbose Running: /usr/lib/iceweasel/firefox-bin firefox
+ [ ]
+ exec /usr/lib/iceweasel/firefox-bin firefox
--- /usr/lib/iceweasel/iceweasel.orig
+++ /usr/lib/iceweasel/iceweasel
@@ -261,7 +261,7 @@
set -- "$@" "-a" "${APPLICATION_ID}"
-if [ $# -ne 0 ]; then
+if [ $# -ne 2 ]; then
shift
fi
OPTIONS="$@"
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