So I got FF and someone tried to download YouTube vids - but obviously got something fake. Now every time I right click at the end there's a list Free YouTube download, free YouTube to mp3 etc... how can I remove it?

Thanks for the help in advance

Sorry can't get a print screen cause the menu disappears

Check your add ons as it's most likely in there.

Click Tools > Add-Ons > Extensions tab and see if there is anything in there that may be adding extra options.