Also new in this beta are Retina support for OS X 10.7 and up, something the company announced last month. Mozilla also added preliminary WebRTC support and, after quite a bit of development time, its built-in PDF viewer for Firefox. Firefox 18 will also allow users to disable insecure content on HTTPS secure websites.
The other important new feature in Firefox 18 is support for W3C touch events, which will replace Mozilla’s own MozTouch events for users with touch-enabled screens, though just about 1.1 percent of Firefox users (and 4.4 percent of Firefox users on Windows 8) currently use touchscreens.
The Firefox 18 beta with all of these updates should find its way into the stable release channel by the second week of 2012. Until then, you can try the beta version for Windows, Mac and Linux by downloading it here.