1 files changed, 5 insertions, 4 deletions
diff --git a/browser/modules/ProcessHangMonitor.sys.mjs b/browser/modules/ProcessHangMonitor.sys.mjs
index f0939449c9..e0f91cdf93 100644
--- a/browser/modules/ProcessHangMonitor.sys.mjs
+++ b/browser/modules/ProcessHangMonitor.sys.mjs
@@ -210,7 +210,7 @@ export var ProcessHangMonitor = {
     return func(report);
   },
 
-  observe(subject, topic, data) {
+  observe(subject, topic) {
     switch (topic) {
       case "xpcom-shutdown": {
         Services.obs.removeObserver(this, "xpcom-shutdown");
@@ -240,7 +240,7 @@ export var ProcessHangMonitor = {
         // Install event listeners on the new window in case one of
         // its tabs is already hung.
         let win = subject;
-        let listener = ev => {
+        let listener = () => {
           win.removeEventListener("load", listener, true);
           this.updateWindows();
         };
@@ -548,10 +548,11 @@ export var ProcessHangMonitor = {
       return;
     }
 
-    // Show the "debug script" button unconditionally if we are in Developer edition,
-    // or, if DevTools are opened on the slow tab.
+    // Show the "debug script" button unconditionally if we are in Developer or Nightly
+    // editions, or if DevTools are opened on the slow tab.
     if (
       AppConstants.MOZ_DEV_EDITION ||
+      AppConstants.NIGHTLY_BUILD ||
       report.scriptBrowser.browsingContext.watchedByDevTools
     ) {
       buttons.push({