The option "search pages in New Zealand" (I live in New Zealand) has disappeared from my homepage. How do I restore this please?

I live in New Zealand and am using a desktop computer with windows xp. I have always used Mozilla Firefox as my web browser and have always had the option of "search pages in New Zealand" on my homepage. I must have had a web browser modifier bug in my computer and after running a scan, was able to remove it. However the above option of "search pages in New Zealand" disappeared and I don't know how to restore it. I am currently using Firefox version 3.5.19. I realise this is an outdated version but I am quite happy with it. Can someone there kindly help me with my query. Many thanks.