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How to change Language in Firefox interface to English in Windows?

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I cannon find where to change settings of interface. I need English to be the interface language.

Giải pháp được chọn

If the Firefox user interface (toolbars) is in the wrong language or if you want to change the current language then get Firefox in the language of your choice.

You can find the full version of the current Firefox release (41.0.2) in all languages and all operating systems here:

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Giải pháp được chọn

If the Firefox user interface (toolbars) is in the wrong language or if you want to change the current language then get Firefox in the language of your choice.

You can find the full version of the current Firefox release (41.0.2) in all languages and all operating systems here:

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Hi, I already have Firefox installed (for years), with a bunch of add-ons.

If I download a new version of FF in another language, will I be able to update FF's interface language as well?

This post https://support.mozilla.org/en-US/questions/1078935 says that I need to uninstall FF first, then install it in another language. Will I lose all my settings if I do this?

Thanks!

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Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and (re)install or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

You can use this button to go to the current Firefox profile folder:

Note that you can install additional language packs if you want to be able to switch the language in the user interface.

You can find the full version of the current Firefox release (43.0.4) in all languages and all operating systems here: