Some webpage shows up whenever I open Firefox?

I noticed in the past two days some weird website showing as my homepage once I start Firefox although I made my homepage Google.com, This is the webpage that appears when I start Firefox:

http://www.istartsurf.com/?type=sc&ts=1407051863&from=ild&uid=ST500LT012-9WS142_S0V43Q6DXXXXS0V43Q6D

And when I open a new tab, a weird link appears too (although a new tab shouldn't have any link) this is the link:

chrome://quick_start/content/index.html

I just installed Firefox 31.0 hoping the update would fix the problem but it didn't.

If it's some stupid Malware then, can someone please tell me how did it get into my laptop, and where could I find it, and how to remove it.

I have a G580 Lenovo laptop & Windows 7 Ultimate 64-bit, 4 GB ram

Guest

Google something like "remove istartsurf" and that should help. It does sound like malware. You may have downloaded it with something else.

hiddenmyname