diff --git a/browse/test/snapshot.test.ts b/browse/test/snapshot.test.ts
index d3c012eaf..0d175ce98 100644
--- a/browse/test/snapshot.test.ts
+++ b/browse/test/snapshot.test.ts
@@ -14,7 +14,10 @@ import { handleMetaCommand } from '../src/meta-commands';
 import * as fs from 'fs';
 
 const handleReadCommand = (cmd: string, args: string[], b: BrowserManager) =>
-  _handleReadCommand(cmd, args, b.getActiveSession());
+  // Regression: the bridge must forward `b` — read-commands' now-unconditional
+  // JS-origin assertion calls bm.hasCookieImports(); omitting it TypeErrors
+  // every read.
+  _handleReadCommand(cmd, args, b.getActiveSession(), b);
 const handleWriteCommand = (cmd: string, args: string[], b: BrowserManager) =>
   _handleWriteCommand(cmd, args, b.getActiveSession(), b);