How to change the language settings in firefox using JavaScript

My question is: how to change the language settings in the use of JavaScript in firefox:

I want to set the value of intl.accept_languages en using JavaScript.

How can I do?

EDIT: The reason mail, I want to do is to be able to run selenium for different languages test scenarios with manually change them rather progrmmetically

You will need to close and open the pref via user.js or prefs.js before restarting Firefox to perform the next test.

See:

Tags: Firefox

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