Firefox 51.0 Beta 2
Mozilla Firefox is a fast, light and tidy open source web browser – At its public launch in 2004 Mozilla Firefox was the first browser to challenge Microsoft Internet Explorer’s dominance. Since then, Mozilla Firefox has consistently featured in the top 3 most popular browsers globally.
The key features that have made Mozilla Firefox so popular are simple ,effective UI
Mozilla put of a lot of resources into creating simple but effective UI aimed at making browsing quicker and easier.
Firefox was first browser to introduce private browsing feature which allows you to use internet more anonymously , securely.
Personalisation & Development
One of the best features of Firefox UI is customization