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How to change the language for toolbar?

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My firefox browser toolbar (Files, Bookmarks, History...)previously was set as English but the language change to Chinese when I updated the version. How to I change it back to English?

My firefox browser toolbar (Files, Bookmarks, History...)previously was set as English but the language change to Chinese when I updated the version. How to I change it back to English?

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You can find all Firefox versions here:

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Will all my bookmarks disappear? Possible to change version without loosing my data?

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Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a (re)install, but make sure that you do not select to remove personal data if you uninstall Firefox.