2 files changed, 15 insertions, 3 deletions
diff --git a/packages/browser/src/methods/startRegistration.ts b/packages/browser/src/methods/startRegistration.ts
index 9f4a104..2ad3089 100644
--- a/packages/browser/src/methods/startRegistration.ts
+++ b/packages/browser/src/methods/startRegistration.ts
@@ -70,7 +70,7 @@ export async function startRegistration(
     try {
       responsePublicKeyAlgorithm = response.getPublicKeyAlgorithm();
     } catch (error) {
-      // pass
+      warnOnBrokenImplementation('getPublicKeyAlgorithm()', error as Error);
     }
   }
 
@@ -82,7 +82,7 @@ export async function startRegistration(
         responsePublicKey = bufferToBase64URLString(_publicKey);
       }
     } catch (error) {
-      // pass
+      warnOnBrokenImplementation('getPublicKey()', error as Error);
     }
   }
 
@@ -94,7 +94,7 @@ export async function startRegistration(
         response.getAuthenticatorData(),
       );
     } catch (error) {
-      // pass
+      warnOnBrokenImplementation('getAuthenticatorData()', error as Error);
     }
   }
 
@@ -116,3 +116,14 @@ export async function startRegistration(
     ),
   };
 }
+
+/**
+ * Visibly warn when we detect an issue related to a passkey provider intercepting WebAuthn API
+ * calls
+ */
+function warnOnBrokenImplementation(methodName: string, cause: Error): void {
+  console.warn(
+    `The browser extension that intercepted this WebAuthn API call incorrectly implemented ${methodName}. You should report this error to them.\n`,
+    cause,
+  );
+}
diff --git a/packages/browser/src/setupTests.ts b/packages/browser/src/setupTests.ts
index 2ac528a..db41d57 100644
--- a/packages/browser/src/setupTests.ts
+++ b/packages/browser/src/setupTests.ts
@@ -2,6 +2,7 @@
 // jest.spyOn(console, 'log').mockImplementation();
 // jest.spyOn(console, 'debug').mockImplementation();
 // jest.spyOn(console, 'error').mockImplementation();
+jest.spyOn(console, 'warn').mockImplementation();
 
 /**
  * JSDom doesn't seem to support `credentials`, so let's define them here so we can mock their