Firefox & Chrome Cache on RAM Drive -Fedora / Ubuntu

Update For Fedora 15
Firefox will work with the given below procedure.
For Chrome
sudo gedit /usr/local/share/applications/google-chrome.desktop
Change line from
#Exec=/opt/google/chrome/google-chrome %U
TO
Exec=/opt/google/chrome/google-chrome --disk-cache-dir="/tmp/ram/"


OR
You can use following commands for the ease of use.
rm -rf ~/.cache/google-chrome
ln -s /tmp/ram/ ~/.cache/google-chrome

Update For Ubuntu 11.04
Firefox will work with the given below procedure.

For Chrome
sudo gedit /usr/share/applications/google-chrome.desktop
Change line from
#Exec=/opt/google/chrome/google-chrome %U
TO
Exec=/opt/google/chrome/google-chrome --disk-cache-dir=`/tmp/ram/`


OR
You can use following commands for the ease of use.
rm -rf ~/.cache/google-chrome
ln -s /tmp/ram/ ~/.cache/google-chrome

This post is further updated based on comments.

By storing browser cache to ram disk, you can improve browsing speed. Especially if you are surfing all day.
Now a days modern computers are equipped with more than required ram. Part of this RAM can be used for caching purpose.
Also this will spare you from cleaning disk clutter.

By default RAM drive size may / may not be enough. Increase it to 512Mb or whatever size you wish to allot for caching. Use following method to change default ram_size.

Here for example, we are increasing ram_size to 512mb
On Fedora System.

su
vi /boot/grub/grub.conf
#append ramdisk_size=512000 at the end of kernel parameter.
#e.g 
#Before change
        kernel /vmlinuz-2.6.35.10-74.fc14.i686 ro root=UUID=dbea17b6-292a-435e-a4d7-d202b772e6aa rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us quiet
 
#After change
        kernel /vmlinuz-2.6.35.10-74.fc14.i686 ro root=UUID=dbea17b6-292a-435e-a4d7-d202b772e6aa rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us ramdisk_size=512000 quiet

On Ubuntu System (UPDATE– 10.10 & above).

vi /etc/default/grub
change line GRUB_CMDLINE_LINUX=”"
to GRUB_CMDLINE_LINUX=”ramdisk_size=512000″
Save the file and run
 
update-grub

OR

su
vi /boot/grub/grub.cfg
#append ramdisk_size=512000 at the end of linux parameter.
#e.g 
#Before change
 
linux	/boot/vmlinuz-2.6.35-22-generic root=UUID=a54a4a62-f264-4c04-a86f-83addaad2e55 ro   quiet splash
 
#After change
lnux	/boot/vmlinuz-2.6.35-22-generic root=UUID=a54a4a62-f264-4c04-a86f-83addaad2e55 ro ramdisk_size=512000 quiet splash

UPDATE–
For Ubuntu 10.04 use /boot/grub/menu.lst
Also If content above mentioned rc.local does not work use following.

#!/bin/sh -e
if [ ! -e /tmp/ram ]; then
mkdir /tmp/ram
fi
mke2fs -q -m 0 /dev/ram0
mount /dev/ram0 /tmp/ram/
chmod 777 /tmp/ram/ -R
 
exit 0

REBOOT YOUR SYSTEM TO LET CHANGE TAKE EFFECT.

As root user, Mount RAM drive as /tmp/ram. Following commands you can save in /etc/rc.local to get executed at every boot.

mkdir /tmp/ram
mke2fs -m 0 /dev/ram0
mount /dev/ram0 /tmp/ram/
chmod 777 /tmp/ram/ -R

UPDATE—
OR you may use tmpfs, which is convenient

mount -t tmpfs -o size=512M,mode=0744 tmpfs /tmp/ram1/
chmod 777 /tmp/ram/ -R

Change browser caching location.
Firefox
type about:config in address bar, search for browser.cache.disk.parent_directory. change its location to /tmp/ram/firefox or any other directory if you are going to save Chrome cache on same ram drive. This will help you identify each cache. By default firefox stores cache in cacheme whereas chrome in Cache folder.

Restart firefox, you’ll find new folder in /tmp/ram
Note: for caching to work make sure browser.cache.disk.capacity is set to true

Chrome
For chrome its extremely easy. append –disk-cache-dir=”/tmp/ram/” in launcher
e.g

/opt/google/chrome/google-chrome --disk-cache-dir="/tmp/ram/" 

This is all you need, now onwards on every reboot / boot of your computer, ram drive will be created as /tmp/ram. And chrome / firefox will create cache dir.
Change of cache path, does not affect bookmarks, its all stored in $USER folder.

Thanks for the comments.
Its improved post.