Tab switch position, more flexible
First, the obvious difference is that the tabs have been moved to a new location, located at the top of the browser. In addition, if you start typing the web address into a tab, Firefox checks to see if it has been opened on another tab, if it does, it allows to switch to that tab instead of opening a new tab. If you don't like the tabs above, you can switch down to the same, simply by clicking View > Toolbars > Tabs on top .
Manage Tab in groups
If each browser session you normally open multiple tabs at a time, it might be a little confusing for you to track tabs. Firefox 4 has a feature called " Panorama " that lets you organize tabs into groups. You can easily transfer a certain tab to any group. To enable this feature, select " Customize " in the toolbar and add the " Tab Groups " button by dragging and dropping the toolbar .
Tab like application
If the open page is frequently accessed by you, right-click the tab and select " Pin as App Tab ", thus creating a small tab (mini-tab) attached to the top of the tab range, automatically loading each time you open Firefox. Mozilla suggests doing this with Web mail, but you can apply it to any kind of website. The example in the picture is 3 mini-tabs: Slashdot , Gmail and Twitter .
Add-on management
The Add-ons window (click Tools > Add-ons ) is not only convenient for you to monitor the extensions you have installed, but also add-ons that may interest you.
Better HTML5 support
Firefox 4 has better support for HTML5. Points received at http://html5test.com increased from 159 (version 3.6) to 264 (version 4). Meanwhile, IE9 and Google Chrome browsers have 135 and 301 respectively.
Worth to upgrade
If you are using Firefox 3.x, there is no reason not to upgrade to version 4.0. However, if you have switched from Firefox to Chrome, Firefox 4 is unlikely to provide enough to draw you back, such as many new features or at least the end-user interface because it is mostly affected. by Chrome. But anyway, it's worth downloading and . try it?