Anonymous Browsing allows you to completely keep of tracking what you did and where you went while surfing the web but then you don’t use it all the time. Probably we might like to have some set of sites not show up in our browsing history list rather than turning the switch completely on or off.
This is where History Block Firefox extension comes into play. This Add on keeps a lit of blocked site and does not allow them to get listed in the browsing history list.
You can block any site either by doing a right click or add the sitename in the options of the add on. When you want to unblock, open the options for the addon and unblock the blocked site list. Install History Block for yourself