diff --git a/components/devtools/actor.rs b/components/devtools/actor.rs
index 73a05bfe5f3..9ee43dcb13a 100644
--- a/components/devtools/actor.rs
+++ b/components/devtools/actor.rs
@@ -84,6 +84,8 @@ pub struct ActorRegistry {
 
     /// Lookup table for SourceActor names associated with a given PipelineId.
     source_actor_names: RefCell<HashMap<PipelineId, Vec<String>>>,
+    /// Lookup table for inline source content associated with a given PipelineId.
+    inline_source_content: RefCell<HashMap<PipelineId, String>>,
 
     shareable: Option<Arc<Mutex<ActorRegistry>>>,
     next: Cell<u32>,
@@ -99,6 +101,7 @@ impl ActorRegistry {
             old_actors: RefCell::new(vec![]),
             script_actors: RefCell::new(HashMap::new()),
             source_actor_names: RefCell::new(HashMap::new()),
+            inline_source_content: RefCell::new(HashMap::new()),
             shareable: None,
             next: Cell::new(0),
             start_stamp: CrossProcessInstant::now(),
@@ -262,4 +265,20 @@ impl ActorRegistry {
 
         vec![]
     }
+
+    pub fn set_inline_source_content(&mut self, pipeline_id: PipelineId, content: String) {
+        assert!(
+            self.inline_source_content
+                .borrow_mut()
+                .insert(pipeline_id, content)
+                .is_none()
+        );
+    }
+
+    pub fn inline_source_content(&mut self, pipeline_id: PipelineId) -> Option<String> {
+        self.inline_source_content
+            .borrow()
+            .get(&pipeline_id)
+            .cloned()
+    }
 }
diff --git a/components/devtools/lib.rs b/components/devtools/lib.rs
index 22594c9ddd8..03cba49a516 100644
--- a/components/devtools/lib.rs
+++ b/components/devtools/lib.rs
@@ -543,11 +543,14 @@ impl DevtoolsInstance {
     fn handle_create_source_actor(&mut self, pipeline_id: PipelineId, source_info: SourceInfo) {
         let mut actors = self.actors.lock().unwrap();
 
+        let source_content = source_info
+            .content
+            .or_else(|| actors.inline_source_content(pipeline_id));
         let source_actor = SourceActor::new_registered(
             &mut actors,
             pipeline_id,
             source_info.url,
-            source_info.content,
+            source_content,
             source_info.content_type,
         );
         let source_actor_name = source_actor.name.clone();
@@ -613,6 +616,10 @@ impl DevtoolsInstance {
                 source_actor.content = Some(source_content.clone());
             }
         }
+
+        // Store the source content separately for any future source actors that get created *after* we finish parsing
+        // the HTML. For example, adding an `import` to an inline module script can delay it until after parsing.
+        actors.set_inline_source_content(pipeline_id, source_content);
     }
 }
 
diff --git a/python/servo/devtools_tests.py b/python/servo/devtools_tests.py
index 8b3ebf0dbb9..825f52eb3b0 100644
--- a/python/servo/devtools_tests.py
+++ b/python/servo/devtools_tests.py
@@ -112,6 +112,14 @@ class DevtoolsTests(unittest.IsolatedAsyncioTestCase):
         expected_content = open(self.get_test_path("sources/test.html")).read()
         self.assert_source_content(f"{self.base_url}/test.html", expected_content)
 
+    def test_source_content_with_inline_module_import_external(self):
+        self.start_web_server(test_dir=self.get_test_path("sources_content_with_inline_module_import_external"))
+        self.run_servoshell()
+        expected_content = open(
+            self.get_test_path("sources_content_with_inline_module_import_external/test.html")
+        ).read()
+        self.assert_source_content(f"{self.base_urls[0]}/test.html", expected_content)
+
     # Test case that uses innerHTML and would actually need the HTML parser
     # (innerHTML has a fast path for values that don’t contain b'&' | b'\0' | b'<' | b'\r')
     def test_source_content_inline_script_with_inner_html(self):