I've posted before about this little hack on speeding up firefox. The key is that you actually move the entire .mozilla folder from disk to memory. First you have to mount /tmp to memory (some linux distributions may do this by default) adding this line to /etc/fstab and rebooting:

none /tmp tmpfs size=512M,nr_inodes=200k,mode=01777 0 0

Then it's safe to do:

cp -R /home/user/.mozilla /home/user/.mozilla_save
mv /home/user/.mozilla /tmp/mozilla
ln -s /tmp/mozilla /home/user/.mozilla

I updated the script so I can use it as a system init script:


start() {
    mkdir -p /tmp/mozilla
    rsync -avi --delete /home/user/.mozilla_save/ /home/user/.mozilla/

stop() {
    size=`du -xs /home/user/.mozilla/ | awk '{print $1}'`
    digits=`expr length $size`
    if [ $digits -gt 4 ]; then
        rsync -avi --delete /home/user/.mozilla/ /home/user/.mozilla_save/
        echo 'no!'
        exit 0

case "$1" in
     echo $"Usage: $0 {start|stop}"
     exit 1;;

So I placed this script at /etc/init.d/, made it executable and created a link inside /etc/rc.5/

ln -s /etc/init.d/ffsync.sh /etc/rc5.d/S99ffsync

rc5 because the default runlevel on Fedora is 5. You can see yours from /etc/inittab. So every time my system boots the above script runs with the start option (executing the start function) and every time it halts/reboots it runs with the stop option (stop function). In order to be sure that no data loss will occur in the unlikely event of sudden shutdown, I have a cronjob that saves the mozilla folder every 15 minutes.

*/15 * * * * /etc/init.d/ffsync.sh stop

Trust me. With the above hack you'll see a significant difference on firefox's speed. Especially if you're you using firefox's awesome address bar to search through your browser's history.