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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.

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