If you've updated your computer's copy of Firefox to version 13, you've probably already noticed when you open a new tab, it doesn't look like the blank page you used to see in older versions. Now, every time you open a new tab, you see thumbnail images of your most-recently and most-frequently visited pages.
If you're not in love with the way each of these looks & functions, the good news is you can customize them to fit your needs.
You can hide the page (that is, revert it to the blank page you would see in previous versions of Firefox), or customize it by adding, removing or reorganizing & pinning the images to get to where you want to go in one click. Just follow Mozilla's step-by-step instructions to customize your New Tab page: