FYI...

Firefox 58.0 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 23, 2018
New: Performance improvements, including:
Rendering graphics for Windows users by using Off-Main-Thread Painting (OMTP)
Loading pages faster by changing how Firefox caches and retrieves JavaScript
Improvements to Firefox Screenshots:
Copy and paste screenshots directly to your clipboard
Firefox Screenshots now works in Private Browsing mode
Added Nepali (ne-NP) locale
In case you missed it—57 Release privacy and performance feature:
Users can enable Tracking Protection at all times. Learn how to turn Tracking Protection on.
Fixed:
Fonts installed in non-standard directories will no longer appear blank for Linux users
Various security fixes*
Changed:
User profiles created in Firefox 58 (and in future releases) are not supported in previous versions of Firefox. Users who downgrade to a previous version should create a new profile for that version. Learn about alternatives to downgrading on our support site.
Added a warning to alert users and site owners of planned security changes to sites affected by the gradual distrust plan for the Symantec certificate authority

* https://www.mozilla.org/en-US/securi...fox/#firefox58
...
- https://www.mozilla.org/en-US/securi...s/mfsa2018-02/
CVE-2018-5091: Use-after-free with DTMF timers
Critical
CVE-2018-5090: Memory safety bugs fixed in Firefox 58
Critical
CVE-2018-5089: Memory safety bugs fixed in Firefox 58 and Firefox ESR 52.6
Critical
___

Firefox ESR 52.6 released

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

Release notes: https://www.mozilla.org/en-US/firefo.../releasenotes/
Jan 23, 2018
Various stability and regression fixes
Various security fixes*
* https://www.mozilla.org/en-US/securi...firefoxesr52.6
...
- https://www.mozilla.org/en-US/securi...s/mfsa2018-03/
CVE-2018-5091: Use-after-free with DTMF timers
Critical
CVE-2018-5089: Memory safety bugs fixed in Firefox 58 and Firefox ESR 52.6
Critical
___

- https://www.us-cert.gov/ncas/current...curity-Updates
Jan 23, 2018