diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index afcd816eb1c..e03430f694c 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -2840,52 +2840,51 @@ impl ScriptThread {
         metadata: Option<Metadata>,
         can_gc: CanGc,
     ) -> Option<DomRoot<ServoParser>> {
-        let idx = self
+        if self.closed_pipelines.borrow().contains(id) {
+            // If the pipeline closed, do not process the headers.
+            return None;
+        }
+
+        let Some(idx) = self
             .incomplete_loads
             .borrow()
             .iter()
-            .position(|load| load.pipeline_id == *id);
-        // The matching in progress load structure may not exist if
-        // the pipeline exited before the page load completed.
-        match idx {
-            Some(idx) => {
-                // https://html.spec.whatwg.org/multipage/#process-a-navigate-response
-                // 2. If response's status is 204 or 205, then abort these steps.
-                let is20x = match metadata {
-                    Some(ref metadata) => metadata.status.in_range(204..=205),
-                    _ => false,
-                };
+            .position(|load| load.pipeline_id == *id)
+        else {
+            unreachable!("Pipeline shouldn't have finished loading.");
+        };
 
-                if is20x {
-                    // If we have an existing window that is being navigated:
-                    if let Some(window) = self.documents.borrow().find_window(*id) {
-                        let window_proxy = window.window_proxy();
-                        // https://html.spec.whatwg.org/multipage/
-                        // #navigating-across-documents:delaying-load-events-mode-2
-                        if window_proxy.parent().is_some() {
-                            // The user agent must take this nested browsing context
-                            // out of the delaying load events mode
-                            // when this navigation algorithm later matures,
-                            // or when it terminates (whether due to having run all the steps,
-                            // or being canceled, or being aborted), whichever happens first.
-                            window_proxy.stop_delaying_load_events_mode();
-                        }
-                    }
-                    self.senders
-                        .pipeline_to_constellation_sender
-                        .send((*id, ScriptToConstellationMessage::AbortLoadUrl))
-                        .unwrap();
-                    return None;
-                };
+        // https://html.spec.whatwg.org/multipage/#process-a-navigate-response
+        // 2. If response's status is 204 or 205, then abort these steps.
+        let is_204_205 = match metadata {
+            Some(ref metadata) => metadata.status.in_range(204..=205),
+            _ => false,
+        };
 
-                let load = self.incomplete_loads.borrow_mut().remove(idx);
-                metadata.map(|meta| self.load(meta, load, can_gc))
-            },
-            None => {
-                assert!(self.closed_pipelines.borrow().contains(id));
-                None
-            },
-        }
+        if is_204_205 {
+            // If we have an existing window that is being navigated:
+            if let Some(window) = self.documents.borrow().find_window(*id) {
+                let window_proxy = window.window_proxy();
+                // https://html.spec.whatwg.org/multipage/
+                // #navigating-across-documents:delaying-load-events-mode-2
+                if window_proxy.parent().is_some() {
+                    // The user agent must take this nested browsing context
+                    // out of the delaying load events mode
+                    // when this navigation algorithm later matures,
+                    // or when it terminates (whether due to having run all the steps,
+                    // or being canceled, or being aborted), whichever happens first.
+                    window_proxy.stop_delaying_load_events_mode();
+                }
+            }
+            self.senders
+                .pipeline_to_constellation_sender
+                .send((*id, ScriptToConstellationMessage::AbortLoadUrl))
+                .unwrap();
+            return None;
+        };
+
+        let load = self.incomplete_loads.borrow_mut().remove(idx);
+        metadata.map(|meta| self.load(meta, load, can_gc))
     }
 
     /// Handles a request for the window title.
diff --git a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
index 6857cf0dd58..1c5656a2cd1 100644
--- a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
+++ b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
@@ -73,7 +73,21 @@
 
 
 [trusted-types-navigation.html?26-30]
-  expected: CRASH
+  [Navigate a window via form-submission with javascript:-urls w/ default policy in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a window via form-submission with javascript:-urls in report-only mode.]
+    expected: FAIL
+
+  [Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.]
+    expected: FAIL
+
+  [Navigate a frame via form-submission with javascript:-urls in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.]
+    expected: FAIL
+
 
 [trusted-types-navigation.html?06-10]
   expected: CRASH
@@ -94,7 +108,22 @@
 
 
 [trusted-types-navigation.html?11-15]
-  expected: CRASH
+  expected: TIMEOUT
+  [Navigate a window via anchor with javascript:-urls w/ a default policy making the URL invalid in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a window via anchor with javascript:-urls w/ a default policy making the URL invalid in report-only mode.]
+    expected: FAIL
+
+  [Navigate a window via area with javascript:-urls in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a window via area with javascript:-urls w/ default policy in enforcing mode.]
+    expected: TIMEOUT
+
+  [Navigate a window via area with javascript:-urls in report-only mode.]
+    expected: NOTRUN
+
 
 [trusted-types-navigation.html?16-20]
   expected: TIMEOUT
@@ -132,4 +161,17 @@
 
 
 [trusted-types-navigation.html?01-05]
-  expected: CRASH
+  [Navigate a window via anchor with javascript:-urls in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a window via anchor with javascript:-urls w/ default policy in enforcing mode.]
+    expected: FAIL
+
+  [Navigate a window via anchor with javascript:-urls in report-only mode.]
+    expected: FAIL
+
+  [Navigate a window via anchor with javascript:-urls w/ default policy in report-only mode.]
+    expected: FAIL
+
+  [Navigate a frame via anchor with javascript:-urls in enforcing mode.]
+    expected: FAIL
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index de12c35ad2c..c866150f461 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -32,6 +32,13 @@
       {}
      ]
     ],
+    "form-navigate-loop-crash.html": [
+     "1068ccc38eed223cf83a4cbd8fed336b83c0b745",
+     [
+      null,
+      {}
+     ]
+    ],
     "form_reset-crash.html": [
      "b23cbf6aefdef8231e2cc4cb0e6416195d5bdf71",
      [
diff --git a/tests/wpt/mozilla/tests/mozilla/form-navigate-loop-crash.html b/tests/wpt/mozilla/tests/mozilla/form-navigate-loop-crash.html
new file mode 100644
index 00000000000..1068ccc38ee
--- /dev/null
+++ b/tests/wpt/mozilla/tests/mozilla/form-navigate-loop-crash.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<script>
+  window.addEventListener("load", _ => {
+    form.submit();
+    window.frames.stop();
+    iframe.src = "data:text/html,";
+  });
+</script>
+<form id="form">
+<iframe id="iframe"></iframe>