Newtab setting in Firefox 37.0.1

Since a few days, when i open a new tabl in firefox, a unwanted search page (i even do not know the origin) opens.
I want to have just my old good google coming up there
I changed the browser.newtab.url parameter in about:config, but the result is still that other search .
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What search page has suddenly appeared?  A number of programs and malware can change the search engine or add further tabs.

I would recommend a antivirus sweep and use Malwarebytes to check for malware.  I would also check any recently installed freeware.

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LeTayAuthor Commented:
That was indeed the good solution
Glad to have been of service.
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