diff --git a/mozilla/network/mimetype/mime.types b/mozilla/network/mimetype/mime.types
index b66a40a596a..fe80cc66b90 100644
--- a/mozilla/network/mimetype/mime.types
+++ b/mozilla/network/mimetype/mime.types
@@ -43,6 +43,10 @@ exts="rdf"                      type=text/rdf                   \
 desc="Resource Description Framework" icon=internal-gopher-text
 # XXX should this be text/xml?
 
+exts="xul"						type=text/xul					\
+desc="XML-Based User Interface Language" icon=internal-gopher-text
+# XXX whatever applies to RDF might apply to this as well
+
 exts="rtf"                      type=application/rtf            \
 desc="Rich Text Format"         icon=internal-gopher-text
 # note: text/richtext is *not the same format*
diff --git a/mozilla/network/mimetype/ngtypes.h b/mozilla/network/mimetype/ngtypes.h
index 12ac5d27378..77b7239a4b4 100644
--- a/mozilla/network/mimetype/ngtypes.h
+++ b/mozilla/network/mimetype/ngtypes.h
@@ -8,6 +8,8 @@ desc=\"Hypertext Markup Language\" icon=resource:/res/network/gopher-text.gif",
 desc=\"Extensible Markup Language\" icon=resource:/res/network/gopher-text.gif",
 "exts=\"rdf\"                     type=text/rdf                    \
 desc=\"Resource Description Framework\" icon=resource:/res/network/gopher-text.gif",
+"exts=\"xul\"					  type=text/xul						\
+desc=\"XML-Based User Interface Language\" icon=resource:/res/network/gopher-text.gif",
 "exts=\"rtf\"                      type=application/rtf            \
 desc=\"Rich Text Format\"         icon=resource:/res/network/gopher-text.gif",
 "exts=\"pdf\"                      type=application/pdf            \