Trick to Change the Google Logo to your Favorite Google doodle( Firefox users )

Step 1: First you need to install greasemonkey add-on on firefox.

https://addons.mozilla.org/en-US/firefox/addon/748/

Step 2: Then you need to install the gmsearchscripts scripts.

Download it from here: http://code.google.com/p/gmsearchscripts/

Step 3:Now when you will open your google page,you will be presented with a new google logo page instead of the normal one.

Click on that logo and you will be presented with a page with a new Google doodle gallery 

and below every doodle there is a button "Make this my favorite Doodle " and then it will become the new logo of your google homepage.