I see several URLs like this in red

http://www.levelextreme.com/.wav

Why is it so?

Thanks in advance.

In addition, I see several links like this

http://safebrowsing.clients.google.com/safebrowsing/downloads?client=googlechrome&appver=10.0.612.3&pver=2.2&wrkey=AKEgNit4zIHTfI8dzfjM_Yeichc9no1uYstAil4QcOoibuNz-lNBldT0SLabmgX-7t_Uup70uym-lB7dPB8nmq7dsDU3U6L9GA==

What is it?

BTW, I closed most of my GC windows and left only one with a few tabs opened.