Backed out changeset 71099803e692 (bug 1859977) for causing bc failures on browser/components/extensions/test/browser/browser_ext_browserAction_theme_icons.js CLOSED TREE

toolkit/themes/shared/global-shared.css

@@ -96,14 +96,15 @@
 
 /* Lightweight theme roots */
 
-toolbar,
-:root[lwt-popup="light"] panel {
-  color-scheme: light;
-}
-
-toolbar[brighttext],
-:root[lwt-popup="dark"] panel {
-  color-scheme: dark;
+:root:-moz-lwtheme {
+  toolbar,
+  &[lwt-popup="light"] panel {
+    color-scheme: light;
+  }
+  toolbar[brighttext],
+  &[lwt-popup="dark"] panel {
+    color-scheme: dark;
+  }
 }
 
 :root[lwtheme-image] {