hello, this is a scam tactic that is trying to trick you into installing malware, so don't download or execute this kind of stuff! only download firefox from its official location at mozilla.org - in addition updates are handled automatically by firefox so you don't have to download anything (you can initiate a check for ''updates in firefox > help > about firefox''). you might also want to run a full scan of your system with the security software already in place and different tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes], [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner] & [http://www.kaspersky.com/security-scan kaspersky security scan] in order to make sure that there isn't already some sort of malware active on your system that triggers these false alerts. [[Troubleshoot Firefox issues caused by malware]] you could also help by pressing F10 & going to ''help > report web forgery'' while you're on this dubious page - this might get the page into the list of malicious sites that get blocked in firefox (the actual list is maintained by google) or when such pages use the firefox logos or trademarks to trick users into downloading malware you could also file it at https://www.mozilla.org/en-US/legal/fraud-report/.