Hi   !

Good for you to be on the alert, for Search.hfreeliveradio.co is a browser hijacker, which you of course will have to get rid of.

Go to the 3-bar menu => Addons => Extensions and look for any unfamiliar or suspicious looking extensions, like e.g.:

SafeSearch Incognito SearchAssist Incognito

When you find any :   remove them.

Also look in :   Advanced => Network tab => Under : 'Offline Web Content and User Data'

Do the same in Windows' Control Panel => Programs.

However :   most malware will be 'hiding' somewhere , so let's run malware scans :

Further information can be found in this article :
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

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

Also see : https://malwaretips.com/blogs/remove-search-hfreeliveradio-co/

Thanks. I'm following your instructions. Nothing under Add-ons. Nothing in Windows Control panel. Can you point me to where I find 'Offline Web Content and User Data'? If that doesn't work I'll have to try malware scanners. Are they usually safe and don't settle into my PC as I already have AVG Internet Security?

NNEWTON4 said

Can you point me to where I find 'Offline Web Content and User Data'?

3-bar menu (or 'Tools') => Options => Advanced => Network tab => 'Offline Web Content and User Data'

If that doesn't work I'll have to try malware scanners. Are they usually safe and don't settle into my PC as I already have AVG Internet Security?

You will have to run   all   of them   -   they won't interfere with your other security software. The culprit will be   'hiding'   somewhere   (they usually do).

See also the Storage Inspector that shows what data is stored by the currently selected tab.

• https://developer.mozilla.org/en/Tools/Storage_Inspector

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox