diff --git a/components/devtools/actors/timeline.rs b/components/devtools/actors/timeline.rs
index 92482ca40b12..94ab37ce3c72 100644
--- a/components/devtools/actors/timeline.rs
+++ b/components/devtools/actors/timeline.rs
@@ -214,7 +214,7 @@ impl Actor for TimelineActor {
                 **self.is_recording.lock().as_mut().unwrap() = true;
 
                 let (tx, rx) = channel::<TimelineMarker>();
-                let _ = self.script_sender.send(SetTimelineMarkers(self.pipeline, self.marker_types.clone(), tx));
+                self.script_sender.send(SetTimelineMarkers(self.pipeline, self.marker_types.clone(), tx)).unwrap();
 
                 *self.stream.borrow_mut() = stream.try_clone().ok();
 
@@ -254,7 +254,7 @@ impl Actor for TimelineActor {
                 };
 
                 stream.write_json_packet(&msg);
-                let _ = self.script_sender.send(DropTimelineMarkers(self.pipeline, self.marker_types.clone()));
+                self.script_sender.send(DropTimelineMarkers(self.pipeline, self.marker_types.clone())).unwrap();
 
                 if let Some(ref actor_name) = *self.framerate_actor.borrow() {
                     registry.drop_actor_later(actor_name.clone());
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index a8a560179aae..408f4da4ea74 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -805,7 +805,7 @@ impl<'a> WindowHelpers for JSRef<'a, Window> {
     fn emit_timeline_marker(self, marker: TimelineMarker) {
         let sender = self.devtools_marker_sender.borrow();
         let sender = sender.as_ref().expect("There is no marker sender");
-        let _ = sender.send(marker);
+        sender.send(marker).unwrap();
     }
 
     fn set_devtools_timeline_marker(self, marker: TimelineMarkerType, reply: Sender<TimelineMarker>) {
diff --git a/components/script/script_task.rs b/components/script/script_task.rs
index 78d2c108b8c3..62f7381f77e6 100644
--- a/components/script/script_task.rs
+++ b/components/script/script_task.rs
@@ -1017,7 +1017,7 @@ impl ScriptTask {
                     match self.page {
                         PageToRemove::Root => *self.script_task.page.borrow_mut() = None,
                         PageToRemove::Child(id) => {
-                            let _ = self.script_task.root_page().remove(id);
+                            self.script_task.root_page().remove(id).unwrap();
                         }
                     }
                 }
@@ -1349,7 +1349,7 @@ impl ScriptTask {
     fn emit_timeline_marker(&self, marker: TimelineMarker) {
         let sender = self.devtools_marker_sender.borrow();
         let sender = sender.as_ref().expect("There is no marker sender");
-        let _ = sender.send(marker);
+        sender.send(marker).unwrap();
     }
 
     pub fn set_devtools_timeline_marker(&self, marker: TimelineMarkerType, reply: Sender<TimelineMarker>) {