diff --git a/dom/html/HTMLButtonElement.cpp b/dom/html/HTMLButtonElement.cpp
index cab5213da4..7f0852d11d 100644
--- a/dom/html/HTMLButtonElement.cpp
+++ b/dom/html/HTMLButtonElement.cpp
@@ -187,7 +187,7 @@ HTMLButtonElement::ParseAttribute(int32_t aNamespaceID,
     }
 
     if (aAttribute == nsGkAtoms::formmethod) {
-      if (Preferences::GetBool("dom.dialog_element.enabled", false)) {
+      if (Preferences::GetBool("dom.dialog_element.enabled", true)) {
         return aResult.ParseEnumValue(aValue, kFormMethodTableDialogEnabled, false);
       }
       return aResult.ParseEnumValue(aValue, kFormMethodTable, false);
diff --git a/dom/html/HTMLFormElement.cpp b/dom/html/HTMLFormElement.cpp
index 34476cd741..240eaf2b54 100644
--- a/dom/html/HTMLFormElement.cpp
+++ b/dom/html/HTMLFormElement.cpp
@@ -321,7 +321,7 @@ HTMLFormElement::ParseAttribute(int32_t aNamespaceID,
 {
   if (aNamespaceID == kNameSpaceID_None) {
     if (aAttribute == nsGkAtoms::method) {
-      if (Preferences::GetBool("dom.dialog_element.enabled", false)) {
+      if (Preferences::GetBool("dom.dialog_element.enabled", true)) {
         return aResult.ParseEnumValue(aValue, kFormMethodTableDialogEnabled, false);
       }
       return aResult.ParseEnumValue(aValue, kFormMethodTable, false);
diff --git a/dom/html/HTMLInputElement.cpp b/dom/html/HTMLInputElement.cpp
index 718e65c435..7d9a4db1cd 100644
--- a/dom/html/HTMLInputElement.cpp
+++ b/dom/html/HTMLInputElement.cpp
@@ -5936,7 +5936,7 @@ HTMLInputElement::ParseAttribute(int32_t aNamespaceID,
       return aResult.ParseEnumValue(aValue, kFormMethodTable, false);
     }
     if (aAttribute == nsGkAtoms::formenctype) {
-      if (Preferences::GetBool("dom.dialog_element.enabled", false)) {
+      if (Preferences::GetBool("dom.dialog_element.enabled", true)) {
         return aResult.ParseEnumValue(aValue, kFormMethodTableDialogEnabled, false);
       }
       return aResult.ParseEnumValue(aValue, kFormEnctypeTable, false);