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Slackware 15.0: Mozilla Firefox Critical Security Update 2025-343

Linuxsecurity •LinuxSecurity Advisories • December 9, 2025

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/mozilla-firefox-140.6.0esr-i686-1_slack15.0.txz: Upgraded. This update contains security fixes and improvements. For more information, see: (* Security fix *)

Thanks to the friendly folks at the OSU Open Source Lab ( for donating FTP and rsync hosting to the Slackware project! :-) Also see the "Get Slack" section on for additional mirror sites near you. Updated package for Slackware 15.0: ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/mozilla-firefox-140.6.0esr-i686-1_slack15.0.txz Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/mozilla-firefox-140.6.0esr-x86_64-1_slack15.0.txz Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/xap/mozilla-firefox-140.6.0esr-i686-1.txz Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/xap/mozilla-firefox-140.6.0esr-x86_64-1.txz

Slackware 15.0 package: 43034a553e57634a7ee2c9c97698a571 mozilla-firefox-140.6.0esr-i686-1_slack15.0.txz Slackware x86_64 15.0 package: 3ab40272936aa7ee806bbce688f65a03 mozilla-firefox-140.6.0esr-x86_64-1_slack15.0.txz Slackware -current package: da06431fa2cba255019c8ba3d81e5850 xap/mozilla-firefox-140.6.0esr-i686-1.txz Slackware x86_64 -current package: db8d1f2ca1ff284be648cedac591caed xap/mozilla-firefox-140.6.0esr-x86_64-1.txz

Installation instructions: Upgrade the package as root: # upgradepkg mozilla-firefox-140.6.0esr-i686-1_slack15.0.txz

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Slackware 15.0 Updates Mozilla Firefox for Critical Security Fixes Slackware 15.0 has released an update for Mozilla Firefox version 140.6.0esr, addressing critical security vulnerabilities. This update includes essential security fixes and improvements for users of the Slackware operating system. Users are encouraged to apply the update to ensure their systems remain secure. 2 sources 41

Extracted Entities

MD5 Hashes (4)

3ab40272936aa7ee806bbce688f65a03 43034a553e57634a7ee2c9c97698a571 da06431fa2cba255019c8ba3d81e5850 db8d1f2ca1ff284be648cedac591caed