FireFox to capture file plugin cancellation.
diff --git a/bundles/org.eclipse.orion.client.ui/web/orion/inputManager.js b/bundles/org.eclipse.orion.client.ui/web/orion/inputManager.js
index f0fd618..16fcdd2 100644
--- a/bundles/org.eclipse.orion.client.ui/web/orion/inputManager.js
+++ b/bundles/org.eclipse.orion.client.ui/web/orion/inputManager.js
@@ -67,7 +67,8 @@
 		};

 		if(error.name === "Cancel") {

 			return {Severity: "Warning", Message: error.name, Cancel: true};

-		} else if (error.status === 0) {
+		} else if (error.status === 0) {

+			newError.Cancel = true;
 			return newError; // might do better here
 		} else if (error.responseText) {
 			var responseText = error.responseText;