New mozilla-firefox packages are available for Slackware 14.2 and -current to fix a security issue.

Here are the details from the Slackware 14.2 ChangeLog:
+--------------------------+
patches/packages/mozilla-firefox-60.2.2esr-i686-1_slack14.2.txz: Upgraded.
This release contains security fixes and improvements.
For more information, see:
https://www.mozilla.org/security/known-vulnerabilities/firefoxESR.html
https://www.mozilla.org/en-US/security/advisories/mfsa2018-24/
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12387
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project!

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/mozilla-firefox-60.2.2esr-i686-1_slack14.2.txz

Updated package for Slackware x86_64 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/mozilla-firefox-60.2.2esr-x86_64-1_slack14.2.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/xap/mozilla-firefox-60.2.2esr-i686-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/xap/mozilla-firefox-60.2.2esr-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 14.2 package:
6a2487e826dde5fd80bb4e727adf93e7 mozilla-firefox-60.2.2esr-i686-1_slack14.2.txz

Slackware x86_64 14.2 package:
bd501d86faca76521d3faecf05ccbe56 mozilla-firefox-60.2.2esr-x86_64-1_slack14.2.txz

Slackware -current package:
3979303d41d9e13c76093252bfc59a0f xap/mozilla-firefox-60.2.2esr-i686-1.txz

Slackware x86_64 -current package:
d64e16549823c0dcd902719e457ddd49 xap/mozilla-firefox-60.2.2esr-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg mozilla-firefox-60.2.2esr-i686-1_slack14.2.txz

  Mozilla-Firefox (SSA:2018-276-01) Update for Slackware