This is malware or a virus and you need professional help to remove it. Download Windows Defender or Windows Security Essentials, restart your computer in safe mode (Press F8 at the boot screen and choose safe mode with networking) and then run full scans with both windows defender and windows security essentials and see if this helps. If not, I would suggest taking the computer to a tech for help.

See also:

• /tiki-view_forum_thread.php?forumId=1...
• http://forums.mozillazine.org/viewtopic.php?f=38&t=1001235

Gijames198's way didn't work

Never mind, Gijames198's solution does not work.

I figured it out all by myself, all you have to do is:

1. Type: about:config in the address bar.

2. You might get a warning, just click Ill be careful, I promise

3. Then you should see a filter box at the top, type yoog in it,

4. As you type this, items will be filtered from the list and only a few items will remain.

5. Right click each item, and hit Reset one at a time.

6. Now you can change your homepage to anything you want