Hello, Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller (for more info, see this alternate TDSSKiller download page)
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection built-in.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

I have run Malware bytes and others without any results.

These dangerous URLs that are flagged by Kaspersky did not happen until I downloaded the new Firefox -Quantum. The dangerous URLs do not happen unless I run the new Quantum,

Solution - delete Quantum and go back to Chrome.

Maybe I'll try again in the future if Mozilla fixes their problems.

Make sure you downloaded Firefox Quantum from only the official website: https://firefox.com If you did not it is a false copy.

You can check URL's here : https://www.virustotal.com/#/home/url

When you break the url down to it's root https://dynamicspot-9688.kxcdn.com/os/yc/vendor/serving/trackpoint/dynamic.spot.js

https://www.virustotal.com/#/url/5a8dd533a204a037bf294f977d65904ef0b72cac911ddd18bf14305a1b0113ff/detection Virus Total says Kaspersky found it malicious.

So what does this have to do with Firefox 57 ? This issue is a Kaspersky issue and you need to take it up with them if you believe this is a false/positive, do report it to them.

Again this has nothing to with Mozilla Firefox 57

Please let us know if this solved your issue or if need further assistance.