diff --git a/packages/interactivity/CHANGELOG.md b/packages/interactivity/CHANGELOG.md
index abc79853d222b..b9ca382e835d5 100644
--- a/packages/interactivity/CHANGELOG.md
+++ b/packages/interactivity/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Bug Fixes
+
+-   Fix computeds without scope in Firefox ([#64825](https://github.com/WordPress/gutenberg/pull/64825)).
+
 ## 6.6.0 (2024-08-21)
 
 ### Bug Fixes
diff --git a/packages/interactivity/src/proxies/signals.ts b/packages/interactivity/src/proxies/signals.ts
index 6a3f41c149e13..29bd58aaa4fce 100644
--- a/packages/interactivity/src/proxies/signals.ts
+++ b/packages/interactivity/src/proxies/signals.ts
@@ -20,7 +20,7 @@ import { withScope } from '../utils';
 /**
  * Identifier for property computeds not associated to any scope.
  */
-const NO_SCOPE = Symbol();
+const NO_SCOPE = {};
 
 /**
  * Structure that manages reactivity for a property in a state object. It uses