How to Install/Update/Upgrade to Mozilla Firefox 35 on Ubuntu 15.04,  14.10, 14.04 and Linux Mint 17, 17.1 rebecca via PPA
 
The Mozilla Firefox project is a redesign of Mozilla’s browser component, written using the XUL user interface language and designed to be cross-platform, supporting Linux, Android, Microsoft Windows and Mac OS X operating systems. It is a fast, small and very easy-to-use web browser/navigator/explorer that offers many advantages over other similar products, such as the ability to block pop-up windows and the feature-rich tabbed browsing experience.

What’s New in This Release :

• Firefox Hello with new rooms-based conversations model
• Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs
• Improved handling of dynamic styling changes to increase responsiveness
• Implemented HTTP Public Key Pinning Extension (for enhanced authentication of encrypted connections)
• Changed JavaScript ‘let’ semantics to match the ES6 specification
• Resource Timing API implemented
• CSS filters enabled by default
• WebSocket available in Workers
• Added support for the CSS Font Loading API
• Support for inspecting ::before and ::after pseudo elements
• Computed view: Nodes matching the hovered selector are now highlighted
• Show DOM Properties context menu item in inspector
• Reduced resource usage for scaled images
• PDF.js updated to version 1.0.907

For more information about releases note mozilla firefox 35.0 you can follow this page.

To Install / Update / Upgrade to Mozilla Firefox 35 on Ubuntu 15.04 vivid Vervet, ubuntu 14.10 Utopic Unicorn, Ubuntu 14.04 Trusty Tahr (LTS), Ubuntu 13.10/13.04/12.04, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Linux Mint 13 Maya, Pinguy OS 14.04, Elementary OS 0.3 Freya, Elementary OS 0.2 Luna, Peppermint Five, Deepin 2014, LXLE 14.04, Linux Lite 2.0, Linux Lite 2.2 and other Ubuntu derivative systems

sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
sudo apt-get update
sudo apt-get upgrade

Install Mozilla Firefox 35 on Linux Mint / Ubuntu via PPA

sudo apt-add-repository ppa:ricotz/mozilla
sudo apt-get update
sudo apt-get install firefox

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