The Mozilla Foundation has launched a new Firefox Mobile competition for add-on developers aimed at encouraging them to create innovative and compatible mobile add-ons

It was well over a year ago now that news of the Symbian operating system--found on approximately half of global smartphones--going open source broke. The news was interpreted as particularly important to Nokia's forward-looking Symbian strategy, but after all this time, an open source version of Symbian's platform is still only in beta testing.

TechCrunch IT are reporting that Nokia has bought Symbian Ltd, the software development company famous for creating the proprietary operating system for mobile devices, Symbian OS.

Mozilla has launched a contest to spur on development of add-ons for its recently-released Firefox for Mobile browser. Between now and April 12, developers are encouraged to create extensions or other add-ons tailored for the mobile browser.

Symbian, the company behind the popular proprietary mobile/embedded operating system of the same name, just turned 10, but it won't see its next birthday. Nokia, which had long owned a substantial portion of Symbian, announced today that it would be buying the rest of the company, 52% for about 264 million euros, or approximately $410 million.

A startup called Rhomobile announced the first formal release of its dual-licensed, open-source framework for smartphones. Rhodes 1.0 enables "write-once" development, using HTML and Ruby, of native smartphone applications for iPhone, BlackBerry, Windows Mobile, Symbian, and now Android, the company says.

Soon three quarters of the world's smartphones will be running free software.

Nokia announced it plans to acquire all of Symbian, a UK-based mobile phone operating system developer, for £208 million, and will open the software in a move seen as a response to new rival new, Google's Android.

Symbian is the famous operating system that power up most Nokia mobile handsets. This OS was originally developed by Symbian Ltd. but then Nokia claimed it, next to an independent non-profit organization called Symbian Foundation, and implemented it on its devices.