On December 22, 2010 Mozilla has released the new Firefox Beta 4.

Waited for a while, Firefox 4 makes its appearance on the market web browsers.

Among the good parts of the new Firefox 4, besides the fact is still in beta phase includes:
- automatic hiding of the menu, which allows more space for browsing window. It can be shown, like in most applications that work in this way, by pressing ALT key. For those who are accustomed to viewing it permanently, it can be easily displayed, but Firefox button disappear;
- the appearance of Firefox button at the top left, allows browsing through the most frequented areas of the browser as Favorites, History, Firefox etc;
- introducing a web console allows developers an easier development;
- the tabs by default are moved above the address bar, which I think is an advantage because you don't do accidentally clicks on the tabs;
- can be run in parallel with a previous version of Firefox;
- can be run without trace, so that the browser will not save history or something in the address bar;
- expanded support for WebGL;
- destination where a link goes, now can be previewed in the address bar instead of the state;
- you can set the tabs as buttons to conserve space as applications tabs;
- reload button was combined with the stop button;
- major update for HTML 5;
- many internal upgrades vis-a-vis the loading time and manner of loading, engine sites and technologies used;
- for Windows 7 and Vista, creates thumbnails in the preview window and can be selected individual tabs at the start bar;


Among rough description:
- add-ons are not yet aware of this version of the browser;
- status bar is gone;
- problems with PNG images;