Mozilla has now released Firefox 4 RC1 with a  New Look, huge performance enhancements, including  brand new JägerMonkey JavaScript engine which makes it faster at the start up times and graphics rendering to improved page load speed, you’ll notice the difference instantly. Now it is likely a good time to test the next major releases.

This release includes the some features of opera e.g. Design of the user interface, Firefox 4 offers several new features (release notes) including an integrated sync manager, improved methods for tab-switching and organization for tab-heavy users. Firefox 4 RC includes an updated interface for all platforms that’s sleeker and easier to use. New Tab Location, Switch to Tab. Firefox Button, App Tabs

Below are the some New Improved Features.

New Tab Location

Tabs are given top visual priority for more efficient and intuitive browsing.

STAY IN SYNC

Synchronize your settings, passwords, bookmarks, history, open tabs and other customizations across multiple devices so you can take Firefox with you wherever you go.

ORGANIZE YOUR TABS

Reclaim your browser from tab clutter! Drag and drop your tabs into manageable groups that you can organize, name and arrange in a fun and visual way.

MANAGE YOUR ADD-ONS

An easier way to manage your add-ons and discover new options for personalizing your browsing.

Download Firefox 4 RC

Get the beta by going to Firefox.com/m/ on your phone’s default browser.

Source:   mozilla