Log Message:
Update to 42.0

Changelog:
    New Private Browsing with Tracking Protection blocks certain Web elements \ 
that could be used to record your behavior across sites
    New Control Center that contains site security and privacy controls
    New Indicator added to tabs that play audio with one-click muting
    New WebRTC improvements:
        IPV6 support
        Preferences for controlling ICE candidate generation and IP exposure
        Hooks for extensions to allow/deny createOffer/Answer
        Improved ability for applications to monitor and control which devices \ 
are used in getUserMedia
    New Login Manager improvements:
        Improved heuristics to save usernames and passwords
        Edit and show all logins in line, Copy/Paste usernames/passwords from \ 
the Context menu
        Migration imports your passwords to Firefox from Google Chrome for \ 
Windows and Internet Explorer; import anytime from the Login Manager
    Changed Improved performance on interactive websites that trigger a lot of \ 
restyles
    HTML5 Media Source Extension for HTML5 video available for all sites
    HTML5 Support ImageBitmap and createImageBitmap()
    HTML5 Implemented ES6 Reflect
    Developer Ability to save filter presets inside CSS Filter Tooltip
    Developer CSS filter presets in the Inspector
    Developer Configurable Firefox OS Simulator in WebIDE, to simulate reference \ 
devices like phones, tablets, even TVs
    Developer Asynchronous call stacks now allow web developers to follow the \ 
code flow through setTimeout, DOM event handlers, and Promise handlers.
    Developer Remote website debugging over WiFi (no USB cable or ADB needed)
    Developer View HTML source in a tab