Some antiviruses propose you to use their browser plug-ins. For instance, Avast SafeZone propose you reactive defend by checking signatures of keylogers/malware/spyware etc.
But, what's the benefit of browser + embeded antivirus plugin over browser + separate antivirus?
That the file gets scanned in the browser while downloading. This way you can block malware before it's correctly installed on the system.
Most AVs are only able to check for viruses after they've been installed to the system and had the time altering it.
This isn't always the case though. Sometimes your browser also leads the downloaded file automatically through your installed AV.
