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-rw-r--r--browser/base/content/test/fullscreen/head.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/browser/base/content/test/fullscreen/head.js b/browser/base/content/test/fullscreen/head.js
index 4d5543461e..0d56c5a7c9 100644
--- a/browser/base/content/test/fullscreen/head.js
+++ b/browser/base/content/test/fullscreen/head.js
@@ -5,7 +5,7 @@ function waitForFullScreenState(browser, state, actionAfterFSEvent) {
return new Promise(resolve => {
let eventReceived = false;
- let observe = (subject, topic, data) => {
+ let observe = () => {
if (!eventReceived) {
return;
}