Firefox is not a security service, it is a web browser (One that is probably the most secure browser out there, but it isn't a replacement for a good anti-virus). Firefox is 100% free and always will be. There are no fees. Make sure you download it from the proper source, www.mozilla.org, as there are scam sites that try to charge for Firefox. If you don't have a good anti-virus, please use one like Microsoft Security Essentials. http://windows.microsoft.com/en-US/windows/security-essentials-download If you've never used Firefox before, I'd suggest reading the following: * [[How to download and install Firefox on Windows]] * [[Get started with Firefox - An overview of the main features]]