"���on certain browsers". FWIW, I am using SeaMonkey trunk builds which I download from ftp.mozilla.org; my current version is Mozilla/5.0 (X11; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0 SeaMonkey/2.34a1 ID:20141212003001 c-c:46e2006812f2 m-c:5288b15d22de where ID: and what follows are identification data not sent with te UA string, and the preference intl.accept_languages is set to en-us,en,en-gb,fr,fr-fr,eo-eo,eo,nl-nl,nl,es-es,es-ar,es,bg-bg,bg,hu-hu,hu I think Bulgarian and Hungarian (at the end) are spurious; but there is no German anywhere in the list.