Home | Legacy Firefox Extensions | Content Policy | Contact



Sets Firefox/Thunderbird Locale to Windows (MUI) Language on startup. This is most useful in Multi-Language Environment. If you install fx/tb language packs for languages that are installed on the OS, the app language follows automatically. This behavior can be overridden, if the user selects the language explicitly with the "locale switcher" extension.

This extension will not be ported to Webextensions. With FF57, the pref "intl.locale.matchOS" works now as it should on the Windows-version of FF (thanks, Zibi!). So, there is finally no need for this extension anymore.

Download files:


This page is part of the LegacyCollector website.
Disclaimer: All material on this site is property of their respective owners and available under
open licenses to the best of our knowledge. If you are an author and would like anything removed,
then please write an e-mail to legacy [at] collector dot org.