diff --git a/waterfox/biome.json b/waterfox/biome.json
new file mode 100644
index 000000000000..04055e7ea21f
--- /dev/null
+++ b/waterfox/biome.json
@@ -0,0 +1,26 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.1.3/schema.json",
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": false,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineEnding": "lf",
+    "lineWidth": 80,
+    "attributePosition": "auto"
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "correctness": {
+        "noUnknownMediaFeatureName": "off"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "trailingCommas": "es5"
+    }
+  }
+}