That sounds totally bogus. They probably are an advertiser wanting to subscribe you to their service for a couple hundred dollars are year. Avoid! Avoid! Do you use Microsoft's Windows Defender software on your computer, or a non-Microsoft security program? Something? Anything? If you have any doubts about whether this was a random web ad or possibly generated by something on your system, you can supplement your regular security software with the free scanning/cleaning programs listed in our support article: [[Troubleshoot Firefox issues caused by malware]].