<li class="bbli">
WebRTC embetterments: <ul>
<li>
Delay-agnostic AEC enabled
</li>
<li>
Full duplex for GNU/Linux enabled
</li>
<li>
ICE Restart & Update is supported
</li>
<li>
Cloning of MediaStream and MediaStreamTrack is now supported
</li>
<li>
Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know
</li>
<li>
Windows folks: Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode
</li>
<li>
The media parser has been redeveloped using the Rust programming language
</li>
</ul>
</li>
<li class="bbli">
Fixed: <ul>
<li>
Heyo, Jabra & Logitech C920 webcam users. We fixed those pesky WebRTC bugs causing frequency distortions. Buh-bye, squeaky voice!
</li>
<li>
Improved step debugging on last line of functions
</li>
</ul>
</li>
<li class="bbli">
Changed: <ul>
<li>
So long to support for 10.6, 10.7 and 10.8. Now we can focus on where most Mac users are: 10.9. Don’t forget to upgrade!
</li>
<li>
After version 48, SSE2 CPU extensions are going to be required on Windows
</li>
<li>
Au revoir to Windows Remote Access Service modem Autodial
</li>
</ul>
</li>
<li class="bbli">
Developer: <ul>
<li>
WebExtensions support is now considered as stable
</li>
<li>
Want to move absolute & fixed positioned elements? (Who doesn’t, right?) Now you can with our geometry editor.
</li>
<li>
The memory tool now has a tree map view for your debugging pleasure. It’s a little bit of “boo” and a whole lot of “ya.”
</li>
<li>
We’re putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages
</li>
<li>
Content Security Policy (CSP) is now enforced for WebExtensions. (Who’s down with CSP?)
</li>
<li>
Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
</li>
<li>
Add-on development just got easier because you can reload them from about:debugging — because we’re all about debugging.
</li>
<li>
This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
</li>
<li>
Expand network requests from the console panel to view request details in line, so you can see things in context
</li>
<li>
Workers can now use the Web Crypto API
</li>
</ul>
</li>
<pre>sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
sudo apt-get update
sudo apt-get install firefox