(In reply to Riccardo Paolo Bestetti from comment #0) > Set Windows language to English (US) and locale to Italian. What do you mean with "locale"? Regional preferences? What's the language used in Firefox? Please copy the last table you find in about:support, it should have all the relevant information. This might also be relevant https://firefox-source-docs.mozilla.org/intl/locale.html#regional-preferences ``` For that reason, by default, Gecko will only look into OS Preferences if the language portion of the locale of the OS and Firefox match. That means that if Windows is in “en-AU” and Firefox is in “en-US” Gecko will look into Windows Regional Preferences, but if Windows is in “de-CH” and Firefox is in “fr-FR” it won’t. In order to force Gecko to look into OS preferences irrelevant of the language match, set the flag intl.regional_prefs.use_os_locales to true. ```
Bug 1546625 Comment 2 Edit History
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(In reply to Riccardo Paolo Bestetti from comment #0) > Set Windows language to English (US) and locale to Italian. What do you mean with "locale"? Regional preferences? What's the language used in Firefox? Please copy the last table you find in about:support, it should have all the relevant information. This might also be relevant https://firefox-source-docs.mozilla.org/intl/locale.html#regional-preferences > For that reason, by default, Gecko will only look into OS Preferences if the language portion of the locale of the OS and Firefox match. That means that if Windows is in “en-AU” and Firefox is in “en-US” Gecko will look into Windows Regional Preferences, but if Windows is in “de-CH” and Firefox is in “fr-FR” it won’t. In order to force Gecko to look into OS preferences irrelevant of the language match, set the flag intl.regional_prefs.use_os_locales to true.