FYI...

Firefox 57.0.4 released

Start Firefox, then >Help >About >Apply Update ...
-or-
Download: https://www.mozilla.org/en-US/firefox/all/

> https://www.mozilla.org/en-US/firefo.../releasenotes/
Jan 4, 2018
Fixed: Security fixes* to address the Meltdown and Spectre** timing attacks.
* https://www.mozilla.org/en-US/securi...#firefox57.0.4
...
> https://www.mozilla.org/en-US/securi...s/mfsa2018-01/

** https://blog.mozilla.org/security/20...timing-attack/
___

> https://www.us-cert.gov/ncas/current...ecurity-Update
Jan 04, 2018

> https://www.us-cert.gov/ncas/alerts/TA18-004A
Jan 04, 2018