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Quick Accept-Language Switcher 1.1 Compatible with Firefox 57+
by Dan Callahan
Provides a quick way of changing the HTTP Accept-Language header so you can view and test websites with a different locale.
About this Add-on
Also added simple auto-completion, but it won't work until https://bugzil.la/1342708 is fixed. :)
This add-on is not compatible with your version of Firefox because of the following: