1 files changed, 9 insertions, 1 deletions
diff --git a/ext/bg/js/json-schema.js b/ext/bg/js/json-schema.js
index ab4a4817..7a7f2489 100644
--- a/ext/bg/js/json-schema.js
+++ b/ext/bg/js/json-schema.js
@@ -138,7 +138,13 @@ class JsonSchemaProxyHandler {
                 }
 
                 const additionalProperties = schema.additionalProperties;
-                return JsonSchemaProxyHandler.isObject(additionalProperties) ? additionalProperties : null;
+                if (additionalProperties === false) {
+                    return null;
+                } if (JsonSchemaProxyHandler.isObject(additionalProperties)) {
+                    return additionalProperties;
+                } else {
+                    return JsonSchemaProxyHandler._unconstrainedSchema;
+                }
             }
             case 'array':
             {
@@ -491,6 +497,8 @@ class JsonSchemaProxyHandler {
     }
 }
 
+JsonSchemaProxyHandler._unconstrainedSchema = {};
+
 class JsonSchema {
     static createProxy(target, schema) {
         return new Proxy(target, new JsonSchemaProxyHandler(schema));