diff --git a/layout/html/document/src/forms.css b/layout/html/document/src/forms.css
index f189589ce2aa..f1c9419661ad 100644
--- a/layout/html/document/src/forms.css
+++ b/layout/html/document/src/forms.css
@@ -304,7 +304,7 @@ input[type="image"][disabled] {
 }
 
 input[type="image"]:focus {
-  -moz-outline: 1px dotted -moz-FieldText;
+  -moz-outline: 1px dotted invert;
 }
 
 /* file selector */
diff --git a/layout/html/document/src/quirk.css b/layout/html/document/src/quirk.css
index 3efec86e826d..9001c8b2b008 100644
--- a/layout/html/document/src/quirk.css
+++ b/layout/html/document/src/quirk.css
@@ -44,11 +44,6 @@ input[type=image] {
   border: 2px solid blue;
 }
 
-/* border when focused -- only change style to dotted */
-input[type=image]:focus {
-  border-style: dotted;
-}
-
 /* border when disabled -- only change color to gray */
 input[type=image][disabled] {
   border-color: GrayText;
diff --git a/layout/style/forms.css b/layout/style/forms.css
index f189589ce2aa..f1c9419661ad 100644
--- a/layout/style/forms.css
+++ b/layout/style/forms.css
@@ -304,7 +304,7 @@ input[type="image"][disabled] {
 }
 
 input[type="image"]:focus {
-  -moz-outline: 1px dotted -moz-FieldText;
+  -moz-outline: 1px dotted invert;
 }
 
 /* file selector */
diff --git a/layout/style/quirk.css b/layout/style/quirk.css
index 3efec86e826d..9001c8b2b008 100644
--- a/layout/style/quirk.css
+++ b/layout/style/quirk.css
@@ -44,11 +44,6 @@ input[type=image] {
   border: 2px solid blue;
 }
 
-/* border when focused -- only change style to dotted */
-input[type=image]:focus {
-  border-style: dotted;
-}
-
 /* border when disabled -- only change color to gray */
 input[type=image][disabled] {
   border-color: GrayText;