Firefox 21 release adds to Social API, closes security holes

The release of Firefox 21 adds support for new services via its Social API and fixes a number of security flaws, while the Android version of the browser gets new fonts and better HTML5 performance.
Written by Ben Woods, Contributor on

Mozilla has released the latest version of its Firefox web browser, which fixes several security holes as well as adding new services to its Social API.

The not-for-profit Mozilla Foundation released Firefox 21 for the desktop on Tuesday. It also delivered Firefox 21 for Android, too.

"The new social providers in Firefox make it even easier for you to keep up with friends, family, news and events while you surf the web. You can get real time updates about news activity, entertainment or your personal network while you browse the web," Mozilla wrote on its blog.

The Social API was introduced by Mozilla last year, initially with Facebook integration, but the update also adds support for Facebook Messenger for Firefox along with Cliqz, Mixi and msnNOW.

Along with adding more social integration, the release also closed up security holes in the browser rated as high in severity, including two in the Mozilla Maintenance Service — although only one of them left the browser open to potential remote exploits.

Other vulnerabilities in the browser and Thunderbird email client (which has also been patched) were remotely exploitable, including a problem with the address sanitiser discovered by the Google Chrome security team.

Updates to the mobile version of Firefox on Android were minor and included new open source fonts and better HTML5 performance, Mozilla said.

Editorial standards


The 19 best Cyber Monday deals under $30
Amazon Fire TV Stick 4K

The 19 best Cyber Monday deals under $30

Live blog: 100+ of the best Cyber Monday deals
Large white Cyber Monday text with electronics behind it

Live blog: 100+ of the best Cyber Monday deals

The 51 best Cyber Monday deals on Amazon right now
Image of Amazon Echo Show 8 on a wooden table in front of a person cooking and folding pastry dough.

The 51 best Cyber Monday deals on Amazon right now