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-rw-r--r--testing/mochitest/api.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/testing/mochitest/api.js b/testing/mochitest/api.js
index bd578f03b8..fa4422f290 100644
--- a/testing/mochitest/api.js
+++ b/testing/mochitest/api.js
@@ -26,7 +26,7 @@ const windowTracker = {
Services.obs.addObserver(this, "chrome-document-global-created");
},
- async observe(window, topic, data) {
+ async observe(window, topic) {
if (topic === "chrome-document-global-created") {
await new Promise(resolve =>
window.addEventListener("DOMContentLoaded", resolve, { once: true })