How can firefox changed Trojan horse, I fix?

Firefox changed Trojan horse. Whenever I hit a new tab, it changes the appearance of firefox and tries to open a new page, www.trovi.com/

I uninstalled firefox and reinstalled, but which did not set it... Do I need a cleaning of the firefox and all the files?

Any ideas?

tried, impossible to find the broweser newtab url thing...

So I just download an add on that solved the problem

Tags: Firefox

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