I run the Firefox Dev Editons on Windows OS using English language. Firefox Quantum version 57.0 is English; but Firefox Dev Editons version 58.0b1 is Turkish. I can’t change this settings.
Thanks.
Firefox language on most operating systems is determined by the language you download the installer for. To switch language you will most likely have to download a different installer and install that version instead.
Direct Download Link for English US Developer Edition for Windows (64 bit)
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