diff --git a/res/index.html b/res/index.html
index 071f7cf275..4cf1fcf20c 100644
--- a/res/index.html
+++ b/res/index.html
@@ -6,6 +6,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="initial-scale=1" />
+    <meta name="color-scheme" content="light dark" />
     <title>Firefox Profiler</title>
     <link rel="preload" href="/locales/en-US/app.ftl" as="fetch" />
     <style>
