Firefox OS
The Firefox OS is a pretty new OS and is rarely known. It is only available on a few phones. Since the OS is new and only 2 years old, this will cover its latest version, Firefox OS 2.2.
Firefox OS 2.2
In the latest version of the OS, copy and pasting text is now supported by dragging the arrow over the words you want to copy, choosing your search engine is now easier by using the default search engine you have choose. Private browsing is now an option when browsing the web and starting up apps is now a faster process. You can put phone calls on hold from active call screen and text messages can now be sent to email addresses.
In the latest version of the OS, copy and pasting text is now supported by dragging the arrow over the words you want to copy, choosing your search engine is now easier by using the default search engine you have choose. Private browsing is now an option when browsing the web and starting up apps is now a faster process. You can put phone calls on hold from active call screen and text messages can now be sent to email addresses.
Emails can now have attached downloaded files from the downlanger manager, accounts can be manually set up, and now all types or attachements and files recieved can be downladed. In settings, privacy has been updated allowing you to control what data is stored on your phone and what is not.
Contacts can be shared in email format, messaging, and Bluetooth. The home screen is now easier to navigate and and you can group up stuff by the app grouping feature. Languages have also been updated, from reading instead of left to right, to right to left. New developer features have also been added to help the app making process faster, and finding bugs in the current system to make it better.
Sources
https://developer.mozilla.org/en-US/Firefox_OS/Releases/2.2
https://developer.mozilla.org/en-US/Firefox_OS/Releases/2.2