I started facing this problem today and I am not sure how to fix it. Now I am not able to use firefox to surf internet . Now I am using google chrome. My problem is that when I open firefox it opens searchqu.com website and some ads but when I open any other website then again this website comes. I removed addon which says searchqu toolbar and I don't how it appeared there. May be I mistakenly installed it. may be some mistake I did. But now I can't use my mozilaa firefox.

How to make my firefox to work again ?

You should see if there is any program installed with searchqu name in your program list, if it is there then uninstall it. Also see there is any malware installed in your computer.

Furthermore, you may give report of HijackThis - Trend Micro USA .