New seamonkey packages are available for Slackware 14.2 and -current to fix security issues.

Here are the details from the Slackware 14.2 ChangeLog:
+--------------------------+
patches/packages/seamonkey-2.49.3-i586-1_slack14.2.txz: Upgraded.
This update contains security fixes and improvements.
For more information (when it appears), see:
http://www.seamonkey-project.org/releases/seamonkey2.49.3
(* Security fix *)
patches/packages/seamonkey-solibs-2.49.3-i586-1_slack14.2.txz: Upgraded.
+--------------------------+


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 packages for Slackware 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/seamonkey-2.49.3-i586-1_slack14.2.txz
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/seamonkey-solibs-2.49.3-i586-1_slack14.2.txz

Updated packages for Slackware x86_64 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/seamonkey-2.49.3-x86_64-1_slack14.2.txz
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/seamonkey-solibs-2.49.3-x86_64-1_slack14.2.txz

Updated packages for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/seamonkey-solibs-2.49.3-i586-1.txz
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/xap/seamonkey-2.49.3-i586-1.txz

Updated packages for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/l/seamonkey-solibs-2.49.3-x86_64-1.txz
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/xap/seamonkey-2.49.3-x86_64-1.txz


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

Slackware 14.2 packages:
1e94a6f941bc2be48026c71b7a52059f seamonkey-2.49.3-i586-1_slack14.2.txz
e3fda2ec3bfb5d4bcb84a723349f2204 seamonkey-solibs-2.49.3-i586-1_slack14.2.txz

Slackware x86_64 14.2 packages:
1db1651ddda6af2bac7cfbd342a6c0da seamonkey-2.49.3-x86_64-1_slack14.2.txz
25966b61686b42cae6f51fdd27f83fd9 seamonkey-solibs-2.49.3-x86_64-1_slack14.2.txz

Slackware -current packages:
0c14f028feb3b73834c8bbb9f2e89a52 l/seamonkey-solibs-2.49.3-i586-1.txz
ca79e3ce14bae4b7cb79f8bfd817c06b xap/seamonkey-2.49.3-i586-1.txz

Slackware x86_64 -current packages:
484b7eef9e3090697cbe07363d7bf065 l/seamonkey-solibs-2.49.3-x86_64-1.txz
14cbd707a8fad8e6a08d2a668d7226ec xap/seamonkey-2.49.3-x86_64-1.txz


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

Upgrade the packages as root:
# upgradepkg seamonkey-2.49.3-i586-1_slack14.2.txz seamonkey-solibs-2.49.3-i586-1_slack14.2.txz

  Seamonkey (SSA:2018-123-01) Update for Slackware