Firefox 49.0
https://www.mozilla.org/en-US/firefox/49.0/releasenotes/
New
Updated Firefox Login Manager to allow HTTPS pages to use saved HTTP logins. It’s one more way Firefox is supporting Let’s Encrypt and helping users transition to a more secure web.
Added features to Reader Mode that make it easier on the eyes and the ears
- Controls that allow users to adjust the width and line spacing of text
- Narrate, which reads the content of a page out loud
Improved video performance for users on systems that support SSSE3 without hardware acceleration
Added context menu controls to HTML5 audio and video that let users loops files or play files at 1.25x speed
Enhancements for Mac users
- Improved performance on OS X systems without hardware acceleration
- Improved appearance of anti-aliased OS X fonts
Improvements in about:memory reports for tracking font memory usage
Improve performance on Windows systems without hardware acceleration
Fixed
Fixed an issue that prevented users from updating Firefox for Mac unless they originally installed Firefox. Now, those users as well as any user with administrative credentials can update Firefox.
Changed
Ended Firefox for Mac support for OS X 10.6, 10.7, and 10.8.
Ended Firefox for Windows support for SSE processors
Removed Firefox Hello
Re-enabled the default for Graphite2 font shaping
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Available via internal update: Help / About Firefox