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every time i open a new tab the address defaults to radio.onesearch; how do i stop that?

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every time i open a new tab the address defaults to radio.onesearch; how do i stop that?

every time i open a new tab the address defaults to radio.onesearch; how do i stop that?

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Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection built-in.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

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In addition to the above :

As you are dealing with a browser hijacker : Go to the 3-bar menu (or   'Tools') => Addons => Extensions and look for any unfamiliar or suspicious looking extensions, like e.g. :

SafeSearch Incognito SearchAssist Incognito Search for Fire Fox 1.6 SafeSearch ch SafeSearch net Converter.onesearch org File Convertor and Search Addon Findwide Search Engine 1.7

When you find any : remove them.

Do the same in Windows Control Panel.

However :   most malware will be 'hiding' somewhere , and that is why you really need to run the malware scans, as suggested by Mkll .

Run most or all of the listed malware scanners.
They all work differently   -   what one program doesn't pick up, the other might.