Comodo IceDragon 

Comodo IceDragon was developed by Comodo in order to provide users with a rather unique solution combining the advantages of Mozilla Firefox and some of the enhanced features that a developer focusing on security solutions could offer.

The first thing you notice when opening the browser is that it's significantly faster and demands less from your system. It's pretty much the same old Firefox, but better optimized for accessibility and easy browsing, which is a big plus. The browser has a built-n DNS service contributing to the improved speeds. At the same time, all the plug-ins you had in standard Firefox are available for iceDragon.

But the main focus of the browser's development shows immediately after you get comfortable: the heavy security. IceDragon starts off with scanning pages when they are opened using the SiteInspector technology and detecting possible malware, adware of other kinds of dangerous online elements. It also restricts access to your personal data when you are using online services like Google, keeping you virtually unseen and anonymous.

Other notable features include social media integration allowing you to instantly share videos and interesting pages and an extremely comfortable minor tweaks to the interface.

All in all, Comodo IceDragon is a magnificent example of what you can do even to a browser that is good on its own.