As some our our members may already know, Firefox is undergoing significant change this year. By the end of 2017 . . when version 57 rolls out, the changes will be fully implemented.
Essentially, Firefox is moving to the same technology as Google’s Chrome browser (and the open source version of that – – “Chromium”).
Lot’s of reasons for that – too long for this format, but bottom line, it’s just better.
Here’s some additional info below: