. '''Whenever you get a message / popup like that;''' <u>'''DO NOT USE ANY OF'''</u> <u>'''THE PROVIDED LINKS'''</u> <u>'''OR ANY PHONE NUMBERS ! !'''</u> Such messages are only '''Spam''' that could lead you to '''Fake Support.''' Not only can they damage or hack your system, they charge you to do so. You can report such a site at; '''[http://www.google.com/safebrowsing/report_phish/ Google Report Phishing Page]''' {web link} which is the same when done while on site by going to '''Help > Report Web Forgery''' '''[http://www.mozilla.org/en-US/legal/fraud-report/ Help us safeguard Mozilla’s trademarks by reporting misuse]''' {web link} ------------------ You may have ad/mal-ware. 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. Each works differently. If one program misses something, another may pick it up.