register btsync protocol for firefox on gnome (does also work with rslsync)

register-btsync-proto-gnome-firefox.sh

#!/bin/bash

# see http://kb.mozillazine.org/Register_protocol#Linux
gconftool-2 -s /desktop/gnome/url-handlers/btsync/command "`which rslsync` %s" --type String
gconftool-2 -s /desktop/gnome/url-handlers/btsync/enabled --type Boolean true

# get default profile path
ff_profile=$(cat ~/.mozilla/firefox/profiles.ini | grep Path | sed s/^Path=//)
ff_profile_dir="~/.mozilla/firefox/$ff_profile"

# see https://askubuntu.com/a/715465/260072
ff_set() {
  cd $ff_profile_dir
  sed -i 's/user_pref("'$1'",.*);/user_pref("'$1'",'$2');/' user.js  # change if present
  grep -q $1 user.js || echo "user_pref(\"$1\",$2);" >> user.js      # add if non-present
}

ff_set "network.protocol-handler.expose.btsync" true

#ff_set "network.protocol-handler.external.btsync" true # will be inserted automatically
#ff_set "network.protocol-handler.app.btsync" "`which rslsync`" # will be inserted automatically