Mozilla has now finalised the next version of their popular internet browser, Firefox 12 and is ready to download, although as of yet it hasn't been officially publicised. For those curious to see what's changed from version 11, which was released less than six weeks ago, here's what's new:

Windows: Firefox is now easier to update with one less prompt (User Account Control) Page Source now has line numbers Line breaks are now supported in the title attribute Improvements to "Find in Page" to center search result URLs pasted into the download manager window are now automatically downloaded The column-fill CSS property has been implemented Support for the text-align-last CSS property has been added Experimental support for ECMAScript 6 Map and Set objects has been implemented Fixed where WebGL performance may be degraded on some OS X hardware
Just in case there are those still using Windows 2000, Windows XP RTM or XP Service Pack 1, Firefox 12 will be the last version of the browser from Mozilla to officially support those operating systems. Windows XP SP2 and above will only be supported in the next version of Firefox.