Features of Mozilla Firefox 22
* WebRTC
* Display scaling options for high-resolution displays (Windows only as of now)
* Mac OS X:Download progress in dock application icon
* Changed the HTML5 audio/video playback rate
* Social service manager implemented in Add-ons manager
* asm.js optimizations enabled for major performance improvements
* Asynchronous canvas updated
* plain text files display with word-wrap
* for user security, object is no longer accessible from web content
* pointer lock API used outside of fullscreen
* CSS3 firefox implemented and enabled by default
* Added new web notifications
* Added clipboardData API for javascript access to a user's clipboard
* Built-in font inspector
Install Firefox 22 in Ubuntu and Linux Mint
Open Terminal(Alt + Ctrl + T) and paste the following commands
sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
sudo apt-get update
sudo apt-get install firefox