diff --git a/.changeset/sandbox-firefox.md b/.changeset/sandbox-firefox.md
new file mode 100644
index 000000000000..6d3faa894a61
--- /dev/null
+++ b/.changeset/sandbox-firefox.md
@@ -0,0 +1,5 @@
+---
+"@typescript/sandbox": patch
+---
+
+Fix Ctrl+arrow keys in Firefox.
diff --git a/packages/sandbox/src/index.ts b/packages/sandbox/src/index.ts
index b60c9ad5114f..0ac59d19c34d 100644
--- a/packages/sandbox/src/index.ts
+++ b/packages/sandbox/src/index.ts
@@ -77,7 +77,7 @@ const sharedEditorOptions: import("monaco-editor").editor.IEditorOptions = {
   },
   acceptSuggestionOnCommitCharacter: !isAndroid,
   acceptSuggestionOnEnter: !isAndroid ? "on" : "off",
-  accessibilitySupport: !isAndroid ? "on" : "off",
+  accessibilitySupport: !isAndroid ? "auto" : "off",
   inlayHints: {
     enabled: true,
   },