diff --git a/toolbars/bottom-of-window-tabbar-macOS.css b/toolbars/bottom-of-window-tabbar-macOS.css
new file mode 100644
index 0000000..fe3373a
--- /dev/null
+++ b/toolbars/bottom-of-window-tabbar-macOS.css
@@ -0,0 +1,29 @@
+/*
+ * Description: Moves the tab bar down the window. Only for Mac.
+ * 
+ * Screenshot:
+ * 
+ * Tested on Mac
+ *
+ * Contributor(s): Reddit's /u/marciiF
+ * Licenced GPLv3
+ */
+ 
+ 
+ @-moz-document url("chrome://browser/content/browser.xul") {
+    :root:not([tabsintitlebar]) #TabsToolbar {
+        transform: translateY(100vh) !important;
+    }
+    :root:not([tabsintitlebar]) #navigator-toolbox {
+        margin-top: calc(0px - var(--tab-min-height)) !important;
+    }
+    :root:not([tabsintitlebar]) #browser-panel {
+        padding-bottom: var(--tab-min-height) !important;
+    }
+
+    :root:not([tabsintitlebar]) #TabsToolbar              { -moz-box-ordinal-group: 0 !important; }
+    :root:not([tabsintitlebar]) #toolbar-menubar          { -moz-box-ordinal-group: 1 !important; }
+    :root:not([tabsintitlebar]) #nav-bar                  { -moz-box-ordinal-group: 2 !important; }
+    :root:not([tabsintitlebar]) #PersonalToolbar          { -moz-box-ordinal-group: 3 !important; }
+    :root:not([tabsintitlebar]) #navigator-toolbox::after { -moz-box-ordinal-group: 4 !important; }
+}