Updates 11/3/15 - Firefox, Avast 2016

Firefox Version 42.0, first offered to Release channel users on November 3, 2015 

  https://www.mozilla.org/en-US/firefox/42.0/releasenotes/

What’s New

• 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; see https://support.mozilla.org/en-US/kb/control-center-site-privacy-and-security-firefox

• 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

  Implemented ES6 Reflect

• HTML5

  Support ImageBitmap and createImageBitmap()

• HTML5

  Media Source Extension for HTML5 video available for all sites

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Internal update via HELP / About Firefox

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EDIT:   For SECURITY fixes in today's FF release, see lower in this thread.