When enabled, this feature will automatically close any browser tab that tries to open a blocked website.
Only allow access to websites that you have specifically added to your whitelist. All other websites will be blocked by default.
Blocking a main domain like facebook.com will also block all of its subdomains, such as apps.facebook.com and ru-ru.facebook.com.
If a website is blocked (e.g., facebook.com), any embedded content from that site—like widgets, buttons, or frames—will also be blocked on other pages.