Norton Personal Firewall is a computer firewall application produced by Symantec. It includes capabilities such as ad blocking, different rule sets for different networks, a privacy feature to prevent the unwanted disclosure of private information, and control of individual applications' Internet access. It is often bundled with other Norton products such as their antivirus program, Norton Antivirus.
The ad-blocking feature of this software rewrites the HTML that one's browser uses to display Web pages. It searches for any text it believes is related to ads and prevents the web page from being displayed. When this happens, there is no notification from Norton Personal Firewall.citation needed
