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Allows to change the language identifier sent to webservers to whatever language you need.

This addon allows to easily change the language identifier that is sent to webservers.

Top features:

• Fully configurable. There are 5 preconfigured languages, but it's up to you add more languages or edit/delete the preconfigured ones.
• Modifies the Accept-Language header to reflect your selected language.
• Modifies the navigator.language and navigator.languages JavaScript preferences to reflect your selected language.
• Sends a languagechange event to all open tabs whenever you change the language.