diff --git a/browser/themes/addons/monochromatic/abstract/balanced/manifest.json b/browser/themes/addons/monochromatic/abstract/balanced/manifest.json
index 8cc82fd6f5af9..0ca50db64591e 100644
--- a/browser/themes/addons/monochromatic/abstract/balanced/manifest.json
+++ b/browser/themes/addons/monochromatic/abstract/balanced/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 0%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(15, 62%, 34%)",
       "ntp_background": "hsl(15, 39%, 80%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/abstract/bold/manifest.json b/browser/themes/addons/monochromatic/abstract/bold/manifest.json
index 30f742c229e7b..11ebc54f18434 100644
--- a/browser/themes/addons/monochromatic/abstract/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/abstract/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(15, 89%, 86%)",
       "toolbar_field_focus": "hsl(12, 5%, 21%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(15, 10%, 16%)",
       "ntp_background": "hsl(20, 9%, 13%)",
       "ntp_card_background": "hsl(12, 5%, 21%)",
diff --git a/browser/themes/addons/monochromatic/abstract/soft/manifest.json b/browser/themes/addons/monochromatic/abstract/soft/manifest.json
index 57561b216dedf..d0ce14d7e4537 100644
--- a/browser/themes/addons/monochromatic/abstract/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/abstract/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(30, 5%, 8%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(15, 100%, 78%)",
       "ntp_background": "hsl(16, 73%, 97%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/cheers/balanced/manifest.json b/browser/themes/addons/monochromatic/cheers/balanced/manifest.json
index 5951975a499b7..fa823670919bc 100644
--- a/browser/themes/addons/monochromatic/cheers/balanced/manifest.json
+++ b/browser/themes/addons/monochromatic/cheers/balanced/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 100%)",
       "toolbar_field_focus": "hsl(0, 0%, 20%)",
       "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(42, 95%, 60%)",
       "ntp_background": "hsl(0, 0%, 9%)",
       "ntp_card_background": "hsl(0, 0%, 20%)",
diff --git a/browser/themes/addons/monochromatic/cheers/bold/manifest.json b/browser/themes/addons/monochromatic/cheers/bold/manifest.json
index 0f70ca5771da5..a4a82f63bb709 100644
--- a/browser/themes/addons/monochromatic/cheers/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/cheers/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(42, 96%, 65%)",
       "toolbar_field_focus": "hsl(0, 0%, 16%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(0, 0%, 11%)",
       "ntp_background": "hsl(0, 0%, 11%)",
       "ntp_card_background": "hsl(0, 0%, 16%)",
diff --git a/browser/themes/addons/monochromatic/cheers/soft/manifest.json b/browser/themes/addons/monochromatic/cheers/soft/manifest.json
index b8e7b3c4bc2f2..c9cc73939689c 100644
--- a/browser/themes/addons/monochromatic/cheers/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/cheers/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 0%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(42, 100%, 70%)",
       "ntp_background": "hsl(43, 61%, 92%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/elemental/balanced/manifest.json b/browser/themes/addons/monochromatic/elemental/balanced/manifest.json
index b41e1e25cdcc6..5d793e3c7631c 100644
--- a/browser/themes/addons/monochromatic/elemental/balanced/manifest.json
+++ b/browser/themes/addons/monochromatic/elemental/balanced/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 0%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(38, 7%, 30%)",
       "ntp_background": "hsl(42, 8%, 78%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/elemental/bold/manifest.json b/browser/themes/addons/monochromatic/elemental/bold/manifest.json
index fbb7fdb90e329..30c2524bfc7f8 100644
--- a/browser/themes/addons/monochromatic/elemental/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/elemental/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 100%)",
       "toolbar_field_focus": "hsl(40, 7%, 25%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(38, 7%, 30%)",
       "ntp_background": "hsl(38, 7%, 30%)",
       "ntp_card_background": "hsl(40, 7%, 25%)",
diff --git a/browser/themes/addons/monochromatic/elemental/soft/manifest.json b/browser/themes/addons/monochromatic/elemental/soft/manifest.json
index 5922f2bc64489..077d8ca55ec18 100644
--- a/browser/themes/addons/monochromatic/elemental/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/elemental/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(48, 10%, 10%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(45, 6%, 88%)",
       "ntp_background": "hsl(60, 8%, 95%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/foto/balanced/manifest.json b/browser/themes/addons/monochromatic/foto/balanced/manifest.json
index 2560faa3d25b4..76f9f93754abf 100644
--- a/browser/themes/addons/monochromatic/foto/balanced/manifest.json
+++ b/browser/themes/addons/monochromatic/foto/balanced/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 0%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(351, 37%, 40%)",
       "ntp_background": "hsl(351, 37%, 80%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/foto/bold/manifest.json b/browser/themes/addons/monochromatic/foto/bold/manifest.json
index dbc716e30dc7f..771915d93484f 100644
--- a/browser/themes/addons/monochromatic/foto/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/foto/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 100%)",
       "toolbar_field_focus": "hsl(351, 27%, 25%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(350, 32%, 30%)",
       "ntp_background": "hsl(350, 14%, 17%)",
       "ntp_card_background": "hsl(351, 27%, 25%)",
diff --git a/browser/themes/addons/monochromatic/foto/soft/manifest.json b/browser/themes/addons/monochromatic/foto/soft/manifest.json
index 156cd28f11778..f830afadc3e0b 100644
--- a/browser/themes/addons/monochromatic/foto/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/foto/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(351, 32%, 8%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(352, 56%, 84%)",
       "ntp_background": "hsl(354, 33%, 94%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/graffiti/balanced/manifest.json b/browser/themes/addons/monochromatic/graffiti/balanced/manifest.json
index 99ec754fa64e1..fe77c00fedf01 100644
--- a/browser/themes/addons/monochromatic/graffiti/balanced/manifest.json
+++ b/browser/themes/addons/monochromatic/graffiti/balanced/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 0%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(278, 33%, 40%)",
       "ntp_background": "hsl(277, 30%, 86%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/graffiti/bold/manifest.json b/browser/themes/addons/monochromatic/graffiti/bold/manifest.json
index b458d9ff927c1..1ede29dd5abe2 100644
--- a/browser/themes/addons/monochromatic/graffiti/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/graffiti/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 100%)",
       "toolbar_field_focus": "hsl(275, 15%, 22%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(279, 31%, 28%)",
       "ntp_background": "hsl(270, 10%, 12%)",
       "ntp_card_background": "hsl(275, 15%, 22%)",
diff --git a/browser/themes/addons/monochromatic/graffiti/soft/manifest.json b/browser/themes/addons/monochromatic/graffiti/soft/manifest.json
index 8987174aeaac6..4c52a0b59864f 100644
--- a/browser/themes/addons/monochromatic/graffiti/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/graffiti/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(278, 22%, 10%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(278, 79%, 85%)",
       "ntp_background": "hsl(279, 77%, 95%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",
diff --git a/browser/themes/addons/monochromatic/lush/bold/manifest.json b/browser/themes/addons/monochromatic/lush/bold/manifest.json
index 42296d5729019..ae629234236f7 100644
--- a/browser/themes/addons/monochromatic/lush/bold/manifest.json
+++ b/browser/themes/addons/monochromatic/lush/bold/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(0, 0%, 100%)",
       "toolbar_field_focus": "hsl(140, 2%, 28%)",
       "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(139, 16%, 30%)",
       "ntp_background": "hsl(150, 2%, 20%)",
       "ntp_card_background": "hsl(140, 2%, 28%)",
diff --git a/browser/themes/addons/monochromatic/lush/soft/manifest.json b/browser/themes/addons/monochromatic/lush/soft/manifest.json
index d436f77fae139..bf436e9246e52 100644
--- a/browser/themes/addons/monochromatic/lush/soft/manifest.json
+++ b/browser/themes/addons/monochromatic/lush/soft/manifest.json
@@ -31,6 +31,7 @@
       "toolbar_field_text": "hsl(150, 6%, 20%)",
       "toolbar_field_focus": "hsl(0, 0%, 100%)",
       "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
+      "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(147, 25%, 86%)",
       "ntp_background": "hsl(150, 25%, 97%)",
       "ntp_card_background": "hsl(0, 0%, 100%)",