Mozilla has officially announced that the first beta release in the Firefox 21.x branch is now available for download.
The new Firefox 21. 0 Beta 1 for Linux comes shortly after the new stable version arrived in Ubuntu. As usual, the number of changes is impressive.
Highlights of Mozilla Firefox 21.0 Beta 1:
• The three-state UI has been improved for Do Not Track (DNT); • The browser will now suggest how to improve the application's startup time; • Firefox Health Report support has been added, although it's in the preliminary stages; • Users can now restore thumbnails on New tab Page; • History API removals history has been added in Places; • Graphics related performance improvements have been made; • Support for HTML5 <main> element has been added.
A detailed list of changes can be found in the announcement. Download Firefox 21.0 Beta 1 right now from Softpedia. Remember that this is a beta version and it should NOT be installed on production machines. It is intended for testing purposes only.