diff --git a/js/src/tests/ecma/Date/jstests.list b/js/src/tests/ecma/Date/jstests.list
index 1e19f6b3f0b..f1e2f188c0e 100644
--- a/js/src/tests/ecma/Date/jstests.list
+++ b/js/src/tests/ecma/Date/jstests.list
@@ -49,7 +49,7 @@ script 15.9.5.11-5.js
 script 15.9.5.11-6.js
 script 15.9.5.11-7.js
 script 15.9.5.12-1.js
-skip-if(!xulRuntime.shell&&xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script 15.9.5.12-2.js # bug xxx crash
+skip-if(!xulRuntime.shell&&xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script 15.9.5.12-2.js # bug xxx crash
 script 15.9.5.12-3.js
 script 15.9.5.12-4.js
 script 15.9.5.12-5.js
@@ -66,7 +66,7 @@ script 15.9.5.13-7.js
 script 15.9.5.13-8.js
 script 15.9.5.14.js
 script 15.9.5.15.js
-skip-if(!xulRuntime.shell&&xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script 15.9.5.16.js # bug xxx crash
+skip-if(!xulRuntime.shell&&xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script 15.9.5.16.js # bug xxx crash
 script 15.9.5.17.js
 script 15.9.5.18.js
 script 15.9.5.19.js
diff --git a/js/src/tests/js1_5/Array/jstests.list b/js/src/tests/js1_5/Array/jstests.list
index 7b14f67238c..6b18d6ee8bc 100644
--- a/js/src/tests/js1_5/Array/jstests.list
+++ b/js/src/tests/js1_5/Array/jstests.list
@@ -5,7 +5,7 @@ script regress-101964.js
 script regress-107138.js
 fails script regress-108440.js
 script regress-154338.js
-skip-if(xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script regress-157652.js # No test results
+skip-if(xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script regress-157652.js # No test results
 script regress-178722.js
 script regress-255555.js
 script regress-299644.js
@@ -14,7 +14,7 @@ script regress-310351.js
 script regress-311515.js
 script regress-313153.js
 script regress-315509-01.js
-skip-if(xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script regress-330812.js # No test results
+skip-if(xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script regress-330812.js # No test results
 script regress-345961.js
 script regress-348810.js
 script regress-350256-01.js
diff --git a/js/src/tests/js1_5/Regress/jstests.list b/js/src/tests/js1_5/Regress/jstests.list
index 58cc32586f8..ab2a1cb8559 100644
--- a/js/src/tests/js1_5/Regress/jstests.list
+++ b/js/src/tests/js1_5/Regress/jstests.list
@@ -114,7 +114,7 @@ script regress-295052.js
 script regress-295666.js
 script regress-299209.js
 script regress-299641.js
-skip-if(XPCOMABI.match(/x86_64/)||(xulRuntime.OS=="WINNT"&&isDebugBuild)) script regress-303213.js # slow
+skip-if(xulRuntime.XPCOMABI.match(/x86_64/)||(xulRuntime.OS=="WINNT"&&isDebugBuild)) script regress-303213.js # slow
 script regress-306633.js
 script regress-306727.js
 script regress-306794.js
@@ -209,7 +209,7 @@ skip-if(isDebugBuild) script regress-360969-06.js # slow
 script regress-361467.js
 script regress-361617.js
 skip script regress-362583.js # obsolete test
-fails-if(xulRuntime.OS=="WINNT") random-if(xulRuntime.OS=="Linux"&&!XPCOMABI.match(/x86_64/)) skip-if(xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script regress-3649-n.js # No test results on windows, sometimes no test results on 32 bit linux, hangs os/consumes ram/swap on 64bit linux.
+fails-if(xulRuntime.OS=="WINNT") random-if(xulRuntime.OS=="Linux"&&!xulRuntime.XPCOMABI.match(/x86_64/)) skip-if(xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script regress-3649-n.js # No test results on windows, sometimes no test results on 32 bit linux, hangs os/consumes ram/swap on 64bit linux.
 script regress-366122.js
 script regress-366468.js
 script regress-366601.js
@@ -243,7 +243,7 @@ skip-if(xulRuntime.OS=="WINNT"&&isDebugBuild) script regress-418540.js # slow
 script regress-419018.js
 script regress-419803.js
 script regress-420919.js
-fails-if(xulRuntime.OS=="Linux"&&XPCOMABI.match(/x86_64/)) script regress-422348.js # No test results
+fails-if(xulRuntime.OS=="Linux"&&xulRuntime.XPCOMABI.match(/x86_64/)) script regress-422348.js # No test results
 script regress-424311.js
 skip-if(xulRuntime.OS=="WINNT"&&isDebugBuild) script regress-425360.js # slow
 script regress-426827.js
diff --git a/js/src/tests/js1_5/String/jstests.list b/js/src/tests/js1_5/String/jstests.list
index b21dc805fd3..91dfea3a28f 100644
--- a/js/src/tests/js1_5/String/jstests.list
+++ b/js/src/tests/js1_5/String/jstests.list
@@ -5,5 +5,5 @@ random script regress-157334-01.js # BigO
 script regress-179068.js
 random script regress-314890.js # BigO
 random script regress-322772.js # BigO
-random skip-if(xulRuntime.OS=="Linux"&&!isDebugBuild&&!XPCOMABI.match(/x86_64/)) script regress-56940-01.js # BigO, slow if Linux 32bit opt
+random skip-if(xulRuntime.OS=="Linux"&&!isDebugBuild&&!xulRuntime.XPCOMABI.match(/x86_64/)) script regress-56940-01.js # BigO, slow if Linux 32bit opt
 random script regress-56940-02.js # BigO
diff --git a/layout/tools/reftest/reftest.js b/layout/tools/reftest/reftest.js
index 818a4724210..fac3629f786 100644
--- a/layout/tools/reftest/reftest.js
+++ b/layout/tools/reftest/reftest.js
@@ -275,12 +275,15 @@ function ReadManifest(aURL)
     var xr = CC[NS_XREAPPINFO_CONTRACTID].getService(CI.nsIXULRuntime);
     sandbox.MOZ_WIDGET_TOOLKIT = xr.widgetToolkit;
     sandbox.isDebugBuild = gDebug.isDebugBuild;
-    sandbox.xulRuntime = {widgetToolkit: xr.widgettoolkit, OS: xr.OS};
+    sandbox.xulRuntime = {widgetToolkit: xr.widgetToolkit, OS: xr.OS};
 
-    // xr.XPCOMABI throws exception for configurations without full ABI support (mobile builds on ARM)
+    // xr.XPCOMABI throws exception for configurations without full ABI
+    // support (mobile builds on ARM)
     try {
-      sandbox.XPCOMABI = xr.XPCOMABI;
-    } catch(e) {}
+      sandbox.xulRuntime.XPCOMABI = xr.XPCOMABI;
+    } catch(e) {
+      sandbox.xulRuntime.XPCOMABI = "";
+    }
 
     var hh = CC[NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX + "http"].
                  getService(CI.nsIHttpProtocolHandler);