Create and remove temporary Firefox Profiles on the fly

tempprof.sh

#!/bin/sh

set -e
set -u

profname="Danger"
profloc="$(firefox --new-instance --CreateProfile "$profname" 2>&1 |  sed -e s/.*$profname\'\ at\ \'// -e s/\'$//)"
profdir=$(dirname "$profloc")
profini=""$(dirname $profdir)"/profiles.ini"
tempout="$(mktemp)"

echo "$profloc"
echo "$profdir"
echo "$profini"

# start firefox
firefox -P "$profname" 2>&1 > /dev/null

#remove profile from disk

rm -rf "$profdir"

# remove profile from profiles.ini
# use sed's range feature to delete four ish lines
# http://www.theunixschool.com/2012/06/sed-25-examples-to-delete-line-or.html
#sed -in '/Name\=$profname/{s/.*//;x;d;};x;p;${x;p;}' $profini
#sed -in '/^Path\=.*\.$profname/{s/.*//;x;d;};x;p;${x;p;}' $profini

# do the same thing but read the file backwards ;)
tac $profini | sed '1,/e[^0]\]/d' | tac > $tempout
mv $tempout $profini