Finding Firefox bookmarks in Spotlight
First, download this file to your desktop: ffmd.sh
Open a terminal, and run the following:



  sudo mkdir /usr/local
  sudo mkdir /usr/local/bin
  sudo mv ~/Desktop/ffmd.sh
  /usr/local/bin/
  sudo chmod 755 /usr/local/bin/ffmd.sh
  sudo chown root:wheel
  /usr/local/bin/ffmd.sh



Now, schedule the task with crontab. The following line will schedule for 10 minutes: 



  0,10,20,30,40,50 * * * *
  /usr/local/bin/ffmd.sh > /dev/null
  2>&amp;1


This script is in the public domain, and intended for those with a little experience with UNIX.  

the source is here.