Typically the plugin is automatically added to your browser when you install Avast Free Antivirus. Auto-corrects the domain/URL typos (e.g., –> ).Detects and blocks unwanted advertising and tracking systems (sort of a AdBlock alternative).
It is available for all major browsers – Chrome, Mozilla Firefox, Internet Explorer, Opera, and Safari. Avast Online Security is a free browser plugin from Avast (view in Chrome Web Store).
