The organization announced plans this month to shift Firefox OS development away from smartphones to connected devices, and to drop the email client Thunderbird from its portfolio of applications.

As far as Firefox is concerned, 2016 will be a critical year for the browser. Mozilla plans to launch Electrolysis, the multi-process architecture in 2016 which will likely disrupt Firefox's add-on landscape significantly.

Add-on signing will be enforced in 2016 as well which will impact extensions as well.

Today, Mozilla announced that it would ship Rust code and Servo components in Firefox in 2016