how do I change the basic language
I don't speak Spanish but accidentally downloaded firefox in Spanish. I would like to change it to English. All of it, not just individual web sites or help pages. I can't find anywhere where I can do that. That I recognize, anyway. Because it's in Spanish.
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If the Firefox user interface (toolbars) is in the wrong language or if you want to change the current language then download Firefox in the language of your choice.
You can find the full version of the current Firefox release (46.0.1) in all languages and all operating systems here: