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legacy operating systems
About this tag
The legacy operating systems tag on WindowsForum.com covers discussions about older Microsoft Windows versions that are no longer the primary focus of current software support. Recent content highlights the end of Firefox 115 ESR support for Windows 7, 8, and 8.1 in February 2026, marking a significant milestone for users still running these platforms. Topics include migration strategies, security implications of unsupported browsers, and practical options for administrators and individuals. The tag reflects ongoing community interest in maintaining functionality and security on pre-Windows 10 systems, with emphasis on browser compatibility and end-of-life planning.
Mozilla’s support path for users running pre–Windows 10 desktops has reached a clear milestone: Firefox 115 ESR will be the last maintained Firefox build for Windows 7, Windows 8 and Windows 8.1, and Mozilla’s support documentation now states that security updates for those legacy installations...
browser security
end of life browser
end-of-life software
enterprise browser security
esr
firefox
firefox esr
firefox esr 115
firefox esr end life
legacy browser security
legacyoperatingsystemslegacy windows
legacy windows support
linux migration
migration guidance
migration options
migration planning
operating system migration
os migration
os upgrade
os upgrade migration
security patching
security planning
security risks
security updates
security updates end
windows end of life
windows legacy
windows seven