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The open-source developer also patched 28 security vulnerabilities, more than two-thirds of them marked "critical," Mozilla's highest threat rating, and revoked digital certificates that were initially thought to be in the hands of cyber criminals.
Other improvements in Firefox 18 included support for the high-resolution Retina screens used by Apple's MacBook Pro notebooks on OS X Lion and Mountain Lion, an option that lets users disable insecure content found on HTTPS-secured sites, and an opening round of support for WebRTC (for Web real-time communications), an in-development open-source API that adds browser-to-browser voice calls and video chat without requiring separate plug-ins.
WebRTC came from Google, which released its software as open source more than a year ago. Google's Chrome and Opera Software's Opera browser also support WebRTC.
Firefox 18 was missing one previously-promised addition, however: The integrated PDF viewer that was included in the browser's beta didn't make it into the final.
Mozilla also patched 28 vulnerabilities, 20 of them critical, with seven of the remaining labeled "high" and one pegged "moderate."
About a quarter of the bugs were reported by Abhishek Arya, who goes by the nickname "Inferno," of the Chrome security team, Mozilla said in an accompanying advisory. That makes two Firefox upgrades in a row where Arya has accounted for a significant chunk of the reported vulnerabilities Mozilla's patched.
Four of the eight flaws Arya reported to Mozilla were use-after-free vulnerabilities -- a type of memory management bug -- that Google's security engineers have become adept at finding in Chrome and other browsers.
Another five of the 28 flaws were reported by researchers working with HP TippingPoint's Zero Day Initiative (ZDI) bug-bounty program.
Mozilla also followed the lead set by Microsoft and Google last week, revoking a pair of digital certificates issued by a subsidiary of TurkTrust, a Turkish "certificate authority," or CA, in 2011.
"The issue was not specific to Firefox but there was evidence that one of the certificates was used for man-in-the-middle (MITM) traffic management of domain names that the customer did not legitimately own or control," Mozilla stated in an advisory accompanying Firefox 18's release.
Originally published on www.computerworld.com. Click here to read the original story.