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Change interface language

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The methods to change the interface language in Firefox suggested in https://support.mozilla.org/en-US/questions/1018686 and https://support.mozilla.org/en-US/questions/1223719 do not work any longer. Specifically the intl.locale.matchOS and intl.locale.requested settings are not available in the about:config window.

What's the preferred way to change interface language?

I'm using Firefox 61.0 (64-bit) on Windows 10.

The methods to change the interface language in Firefox suggested in https://support.mozilla.org/en-US/questions/1018686 and https://support.mozilla.org/en-US/questions/1223719 do not work any longer. Specifically the intl.locale.matchOS and intl.locale.requested settings are not available in the about:config window. What's the preferred way to change interface language? I'm using Firefox 61.0 (64-bit) on Windows 10.

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Separate Security Issue, please update your Flash 18.0 r0 by removing this as it is too old to be uninstalled properly by Windows : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Re-install with Flash Player Version: 30.0.0.113 Current Version https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, . . . .) Note: Other software is offered in the download. <Windows Only>

HI, what goes now is language packs : https://support.mozilla.org/.../use-firefox-interface-other-languages

Please let us know if this solved your issue or if need further assistance.

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You can create a new string pref with the name intl.locale.requested in case this pref doesn't exist and give its value the language code.