Start and navigate with Firefox very fast.
Install sqlite3 and close
execute this command:
#for f in ~/.mozilla/firefox/*/*.sqlite; do sqlite3 $f 'VACUUM;'; done
start Firefox... you can put this script week cron.
(edited the post) Ok, sorry ch00k, you can see a discussion herehttp://weblog.savanne.be/153-performance-tip-of-the-day
It's essentially compacting the databases (sqlite3) on firefox store data.