diff --git a/content/base/test/test_CrossSiteXHR.html b/content/base/test/test_CrossSiteXHR.html
index 714f406efd1..bd15ffc380c 100644
--- a/content/base/test/test_CrossSiteXHR.html
+++ b/content/base/test/test_CrossSiteXHR.html
@@ -279,29 +279,29 @@ function runTest() {
                  headers: { "x-my-header": "myValue" },
                  allowHeaders: "x-my-header, $_%",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "POST, PUT, XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "POST, PUT, DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "POST, XXDELETE, PUT",
+               { method: "DELETE",
+                 allowMethods: "POST, DELETE, PUT",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETE, POST, PUT",
+               { method: "DELETE",
+                 allowMethods: "DELETE, POST, PUT",
                },
-               { method: "XXDELETE",
-                 allowMethods: "POST ,PUT ,XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "POST ,PUT ,DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "POST,PUT,XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "POST,PUT,DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "POST , PUT , XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "POST , PUT , DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "  ,,  PUT ,,  ,    , XXDELETE  ,  ,",
+               { method: "DELETE",
+                 allowMethods: "  ,,  PUT ,,  ,    , DELETE  ,  ,",
                },
                { method: "POST",
                  body: "hi there",
@@ -369,8 +369,8 @@ function runTest() {
                  headers: { "x-my-header": "myValue" },
                  allowHeaders: "x-my-header y-my-header",
                },
-               { method: "XXDELETE",
-                 allowHeaders: "XXDELETE",
+               { method: "DELETE",
+                 allowHeaders: "DELETE",
                },
                { method: "POST",
                  noAllowPreflight: 1,
@@ -380,34 +380,34 @@ function runTest() {
                  headers: { "Content-Type": "foo/bar" },
                  noAllowPreflight: 1,
                },
-               { method: "XXDELETE",
+               { method: "DELETE",
                },
-               { method: "XXDELETE",
+               { method: "DELETE",
                  allowMethods: "",
                },
-               { method: "XXDELETE",
+               { method: "DELETE",
                  allowMethods: "PUT",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETEZ",
+               { method: "DELETE",
+                 allowMethods: "DELETEZ",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETE PUT",
+               { method: "DELETE",
+                 allowMethods: "DELETE PUT",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETE, PUT Z",
+               { method: "DELETE",
+                 allowMethods: "DELETE, PUT Z",
                },
-               { method: "XXDELETE",
-                 allowMethods: "XXDELETE, PU(T",
+               { method: "DELETE",
+                 allowMethods: "DELETE, PU(T",
                },
-               { method: "XXDELETE",
-                 allowMethods: "PUT XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "PUT DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "PUT Z, XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "PUT Z, DELETE",
                },
-               { method: "XXDELETE",
-                 allowMethods: "PU(T, XXDELETE",
+               { method: "DELETE",
+                 allowMethods: "PU(T, DELETE",
                },
                { method: "MYMETHOD",
                  allowMethods: "myMethod",
diff --git a/content/base/test/test_CrossSiteXHR_cache.html b/content/base/test/test_CrossSiteXHR_cache.html
index 4c0698ae9fa..81cfbbb5a93 100644
--- a/content/base/test/test_CrossSiteXHR_cache.html
+++ b/content/base/test/test_CrossSiteXHR_cache.html
@@ -203,18 +203,18 @@ function runTest() {
            },
            { newTest: "*******" },
            { pass: 0,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE",
+             method: "DELETE",
+             allowMethods: "DELETE",
              cacheTime: 3600
            },
            { pass: 1,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 1,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 0,
              method: "PATCH",
@@ -235,35 +235,35 @@ function runTest() {
              method: "PATCH",
            },
            { pass: 0,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 0,
-             method: "XXPUT",
+             method: "PUT",
            },
            { newTest: "*******" },
            { pass: 0,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE",
+             method: "DELETE",
+             allowMethods: "DELETE",
              cacheTime: 2
            },
            { pause: 2.1 },
            { pass: 0,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { newTest: "*******" },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE, XXPUT",
+             method: "DELETE",
+             allowMethods: "DELETE, PUT",
              cacheTime: 3600
            },
            { pass: 1,
-             method: "XXDELETE",
+             method: "DELETE",
            },
            { pass: 1,
-             method: "XXPUT",
+             method: "PUT",
            },
            { pass: 0,
              method: "PATCH",
@@ -345,7 +345,7 @@ function runTest() {
              headers: { "x-my-header": "x-value" },
            },
            { pass: 0,
-             method: "XXPUT",
+             method: "PUT",
            },
            { pass: 0,
              method: "GET",
@@ -372,50 +372,50 @@ function runTest() {
            },
            { newTest: "*******" },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE",
+             method: "DELETE",
+             allowMethods: "DELETE",
              cacheTime: 3600,
            },
            { pass: 1,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            { pass: 0,
-             method: "XXPUT"
+             method: "PUT"
            },
            { pass: 0,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            { newTest: "*******" },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE",
+             method: "DELETE",
+             allowMethods: "DELETE",
              cacheTime: 3600,
            },
            { pass: 1,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            { pass: 0,
-             method: "XXDELETE",
+             method: "DELETE",
              headers: { "my-header": "value" },
            },
            { pass: 0,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            { newTest: "*******" },
            { pass: 1,
-             method: "XXDELETE",
-             allowMethods: "XXDELETE",
+             method: "DELETE",
+             allowMethods: "DELETE",
              cacheTime: 3600,
            },
            { pass: 1,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            { pass: 0,
              method: "GET",
              noOrigin: 1,
            },
            { pass: 0,
-             method: "XXDELETE"
+             method: "DELETE"
            },
            ];