For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/
For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/
For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/
For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/
For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/
For list of changes see: https://www.mozilla.org/en-US/firefox/40.0/releasenotes/