diff -Nru mozilla-devscripts-0.34/debian/changelog mozilla-devscripts-0.34+rpi1/debian/changelog
--- mozilla-devscripts-0.34/debian/changelog	2013-04-15 10:55:22.000000000 +0000
+++ mozilla-devscripts-0.34+rpi1/debian/changelog	2013-12-16 01:25:26.000000000 +0000
@@ -1,3 +1,11 @@
+mozilla-devscripts (0.34+rpi1) jessie-staging; urgency=medium
+
+  * Use dpkg-vendor --derives-from Ubuntu instead of dpkg-vendor --query vendor
+    in dh_xul-ext so Ubuntu derivatives get treated like Ubuntu and non-ubuntu
+    based debian derivatives get treated like debian.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Mon, 16 Dec 2013 01:24:15 +0000
+
 mozilla-devscripts (0.34) unstable; urgency=low
 
   * Add Iceowl to xpi:Depends auto-detection. Thanks to Matthias Schmitz for
diff -Nru mozilla-devscripts-0.34/dh_xul-ext mozilla-devscripts-0.34+rpi1/dh_xul-ext
--- mozilla-devscripts-0.34/dh_xul-ext	2012-12-07 00:57:57.000000000 +0000
+++ mozilla-devscripts-0.34+rpi1/dh_xul-ext	2013-12-16 01:08:33.000000000 +0000
@@ -125,9 +125,18 @@
     if _VENDOR_ENV in os.environ:
         vendor = os.environ[_VENDOR_ENV]
     else:
-        cmd = ["dpkg-vendor", "--query", "Vendor"]
-        process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
-        vendor = process.communicate()[0].strip()
+        #cmd = ["dpkg-vendor", "--query", "Vendor"]
+        #process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+        #vendor = process.communicate()[0].strip()
+        #Use dpkg-vendor --derives-from Ubuntu rathe than dpkg-vendor --query
+        #So Ubuntu derivatives get treated like ubuntu and non-ubuntu based
+        #Debian derivatives get treated like Debian.
+        cmd = ["dpkg-vendor", "--derives-from", "Ubuntu"]
+        retval = subprocess.call(cmd);
+        if (retval == 0):
+             vendor = "Ubuntu"
+        else: 
+             vendor = "Debian"
     return vendor
 
 def get_xul_apps(script_name, all_distros):