diff --git a/browser/themes/linux/jar.mn b/browser/themes/linux/jar.mn
index 0425a02bc4c7..f287d0d45797 100644
--- a/browser/themes/linux/jar.mn
+++ b/browser/themes/linux/jar.mn
@@ -267,6 +267,8 @@ browser.jar:
   skin/classic/browser/translation-16@2x.png          (../shared/translation/translation-16@2x.png)
   skin/classic/browser/devedition/search.svg          (../shared/devedition/search.svg)
   skin/classic/browser/devedition/urlbar-history-dropmarker.svg            (../shared/devedition/urlbar-history-dropmarker.svg)
+  skin/classic/browser/devedition/urlbar-arrow.png    (../shared/devedition/urlbar-arrow.png)
+  skin/classic/browser/devedition/urlbar-arrow@2x.png (../shared/devedition/urlbar-arrow@2x.png)
 * skin/classic/browser/devtools/common.css            (../shared/devtools/common.css)
 * skin/classic/browser/devtools/dark-theme.css        (../shared/devtools/dark-theme.css)
 * skin/classic/browser/devtools/light-theme.css       (../shared/devtools/light-theme.css)
diff --git a/browser/themes/osx/jar.mn b/browser/themes/osx/jar.mn
index 1cf2572ac635..c390208b61ac 100644
--- a/browser/themes/osx/jar.mn
+++ b/browser/themes/osx/jar.mn
@@ -368,6 +368,8 @@ browser.jar:
   skin/classic/browser/translation-16@2x.png                (../shared/translation/translation-16@2x.png)
   skin/classic/browser/devedition/search.svg                (../shared/devedition/search.svg)
   skin/classic/browser/devedition/urlbar-history-dropmarker.svg            (../shared/devedition/urlbar-history-dropmarker.svg)
+  skin/classic/browser/devedition/urlbar-arrow.png          (../shared/devedition/urlbar-arrow.png)
+  skin/classic/browser/devedition/urlbar-arrow@2x.png       (../shared/devedition/urlbar-arrow@2x.png)
 * skin/classic/browser/devtools/common.css                  (../shared/devtools/common.css)
 * skin/classic/browser/devtools/dark-theme.css              (../shared/devtools/dark-theme.css)
 * skin/classic/browser/devtools/light-theme.css             (../shared/devtools/light-theme.css)
diff --git a/browser/themes/shared/devedition.inc.css b/browser/themes/shared/devedition.inc.css
index f73b871e5008..e1531f681981 100644
--- a/browser/themes/shared/devedition.inc.css
+++ b/browser/themes/shared/devedition.inc.css
@@ -241,10 +241,21 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper {
   -moz-margin-start: 0;
 }
 
-/* Make the white notication box stick out less. */
+/* Swap out the white arrow with a dark one for the dark theme */
+:root[devtoolstheme="dark"] #notification-popup-box {
+  border-image: url("chrome://browser/skin/devedition/urlbar-arrow.png") 0 8 0 0 fill;
+}
+
+@media (min-resolution: 1.1dppx) {
+  :root[devtoolstheme="dark"] #notification-popup-box {
+    border-image: url("chrome://browser/skin/devedition/urlbar-arrow@2x.png") 0 16 0 0 fill;
+  }
+}
+
+/* Make the white notication box stick out less and squish it next to the
+ * identity box since the border image won't be taking up any space. */
 #notification-popup-box {
   border-radius: 0;
-  border: none;
   background: transparent;
 }
 
diff --git a/browser/themes/shared/devedition/urlbar-arrow.png b/browser/themes/shared/devedition/urlbar-arrow.png
new file mode 100644
index 000000000000..c14afc780b4a
Binary files /dev/null and b/browser/themes/shared/devedition/urlbar-arrow.png differ
diff --git a/browser/themes/shared/devedition/urlbar-arrow@2x.png b/browser/themes/shared/devedition/urlbar-arrow@2x.png
new file mode 100644
index 000000000000..e6867a49898e
Binary files /dev/null and b/browser/themes/shared/devedition/urlbar-arrow@2x.png differ
diff --git a/browser/themes/windows/jar.mn b/browser/themes/windows/jar.mn
index e71858b44d09..bec4a58989a8 100644
--- a/browser/themes/windows/jar.mn
+++ b/browser/themes/windows/jar.mn
@@ -367,6 +367,8 @@ browser.jar:
         skin/classic/browser/translation-16@2x.png                  (../shared/translation/translation-16@2x.png)
         skin/classic/browser/devedition/search.svg                  (../shared/devedition/search.svg)
         skin/classic/browser/devedition/urlbar-history-dropmarker.svg            (../shared/devedition/urlbar-history-dropmarker.svg)
+        skin/classic/browser/devedition/urlbar-arrow.png            (../shared/devedition/urlbar-arrow.png)
+        skin/classic/browser/devedition/urlbar-arrow@2x.png         (../shared/devedition/urlbar-arrow@2x.png)
 *       skin/classic/browser/devtools/common.css                    (../shared/devtools/common.css)
 *       skin/classic/browser/devtools/dark-theme.css                (../shared/devtools/dark-theme.css)
 *       skin/classic/browser/devtools/light-theme.css               (../shared/devtools/light-theme.css)