diff --git a/components/script/dom/debuggerglobalscope.rs b/components/script/dom/debuggerglobalscope.rs
new file mode 100644
index 00000000000..9075060aab1
--- /dev/null
+++ b/components/script/dom/debuggerglobalscope.rs
@@ -0,0 +1,88 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use std::sync::Arc;
+
+use base::id::PipelineId;
+use constellation_traits::ScriptToConstellationChan;
+use dom_struct::dom_struct;
+use js::jsval::UndefinedValue;
+use js::rust::Runtime;
+use net_traits::ResourceThreads;
+use profile_traits::{mem, time};
+use servo_url::{ImmutableOrigin, MutableOrigin, ServoUrl};
+
+use crate::dom::bindings::codegen::Bindings::DebuggerGlobalScopeBinding;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+#[cfg(feature = "testbinding")]
+#[cfg(feature = "webgpu")]
+use crate::dom::webgpu::identityhub::IdentityHub;
+use crate::script_module::ScriptFetchOptions;
+use crate::script_runtime::{CanGc, JSContext};
+
+#[dom_struct]
+/// Global scope for interacting with the devtools Debugger API.
+///
+/// <https://firefox-source-docs.mozilla.org/js/Debugger/>
+pub(crate) struct DebuggerGlobalScope {
+    global_scope: GlobalScope,
+}
+
+impl DebuggerGlobalScope {
+    /// Create a new heap-allocated `DebuggerGlobalScope`.
+    #[allow(unsafe_code)]
+    pub(crate) fn new(
+        runtime: &Runtime,
+        mem_profiler_chan: mem::ProfilerChan,
+        time_profiler_chan: time::ProfilerChan,
+        script_to_constellation_chan: ScriptToConstellationChan,
+        resource_threads: ResourceThreads,
+        #[cfg(feature = "webgpu")] gpu_id_hub: Arc<IdentityHub>,
+    ) -> DomRoot<Self> {
+        let global = Box::new(Self {
+            global_scope: GlobalScope::new_inherited(
+                PipelineId::new(), // ??? or TEST_PIPELINE_ID, but that seems worse
+                None,              // ? if needed, see script_thread:745
+                mem_profiler_chan,
+                time_profiler_chan,
+                script_to_constellation_chan, // wrap it in a ScriptToConstellationChan
+                resource_threads,
+                MutableOrigin::new(ImmutableOrigin::new_opaque()),
+                ServoUrl::parse_with_base(None, "about:internal/debugger")
+                    .expect("Guaranteed by argument"), // ???
+                None,
+                Default::default(),
+                gpu_id_hub,
+                None, // ? if needed, see script_thread:745
+                false,
+            ),
+        });
+
+        unsafe {
+            DebuggerGlobalScopeBinding::Wrap::<crate::DomTypeHolder>(
+                JSContext::from_ptr(runtime.cx()),
+                global,
+            )
+        }
+    }
+
+    /// Get the JS context.
+    pub(crate) fn get_cx() -> JSContext {
+        GlobalScope::get_cx()
+    }
+
+    /// Evaluate a JS script in this global.
+    pub(crate) fn evaluate_js(&self, script: &str, can_gc: CanGc) -> bool {
+        debug!("Evaluating Dom in a worklet.");
+        rooted!(in (*GlobalScope::get_cx()) let mut rval = UndefinedValue());
+        self.global_scope.evaluate_js_on_global_with_result(
+            script,
+            rval.handle_mut(),
+            ScriptFetchOptions::default_classic_script(&self.global_scope),
+            self.global_scope.api_base_url(),
+            can_gc,
+        )
+    }
+}
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 01ff74c7c49..b2ab674e29d 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -114,7 +114,7 @@ use crate::dom::reportingobserver::ReportingObserver;
 use crate::dom::serviceworker::ServiceWorker;
 use crate::dom::serviceworkerregistration::ServiceWorkerRegistration;
 use crate::dom::trustedtypepolicyfactory::TrustedTypePolicyFactory;
-use crate::dom::types::MessageEvent;
+use crate::dom::types::{DebuggerGlobalScope, MessageEvent};
 use crate::dom::underlyingsourcecontainer::UnderlyingSourceType;
 #[cfg(feature = "webgpu")]
 use crate::dom::webgpu::gpudevice::GPUDevice;
@@ -2530,6 +2530,9 @@ impl GlobalScope {
             // https://drafts.css-houdini.org/worklets/#script-settings-for-worklets
             return worklet.base_url();
         }
+        if let Some(_debugger_global) = self.downcast::<DebuggerGlobalScope>() {
+            return self.creation_url.clone();
+        }
         unreachable!();
     }
 
@@ -2545,6 +2548,9 @@ impl GlobalScope {
             // TODO: is this the right URL to return?
             return worklet.base_url();
         }
+        if let Some(_debugger_global) = self.downcast::<DebuggerGlobalScope>() {
+            return self.creation_url.clone();
+        }
         unreachable!();
     }
 
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index 8190a0b1dda..3dabb64c11a 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -289,6 +289,7 @@ pub(crate) mod customevent;
 pub(crate) mod datatransfer;
 pub(crate) mod datatransferitem;
 pub(crate) mod datatransferitemlist;
+pub(crate) mod debuggerglobalscope;
 pub(crate) mod dedicatedworkerglobalscope;
 pub(crate) mod defaultteereadrequest;
 pub(crate) mod defaultteeunderlyingsource;
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 18bf170f1f3..939303ebeb8 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -133,6 +133,7 @@ use crate::dom::htmlslotelement::HTMLSlotElement;
 use crate::dom::mutationobserver::MutationObserver;
 use crate::dom::node::{Node, NodeTraits, ShadowIncluding};
 use crate::dom::servoparser::{ParserContext, ServoParser};
+use crate::dom::types::DebuggerGlobalScope;
 #[cfg(feature = "webgpu")]
 use crate::dom::webgpu::identityhub::IdentityHub;
 use crate::dom::window::Window;
@@ -1004,6 +1005,23 @@ impl ScriptThread {
     /// messages on its port.
     pub(crate) fn start(&self, can_gc: CanGc) {
         debug!("Starting script thread.");
+
+        let pipeline_id = PipelineId::new();
+        let script_to_constellation_chan = ScriptToConstellationChan {
+            sender: self.senders.pipeline_to_constellation_sender.clone(),
+            pipeline_id,
+        };
+        let debugger_global = DebuggerGlobalScope::new(
+            &self.js_runtime,
+            self.senders.memory_profiler_sender.clone(),
+            self.senders.time_profiler_sender.clone(),
+            script_to_constellation_chan,
+            self.resource_threads.clone(),
+            #[cfg(feature = "webgpu")]
+            self.gpu_id_hub.clone(),
+        );
+        debugger_global.evaluate_js("console.log('hello world')", can_gc);
+
         while self.handle_msgs(can_gc) {
             // Go on...
             debug!("Running script thread.");
diff --git a/components/script_bindings/webidls/DebuggerGlobalScope.webidl b/components/script_bindings/webidls/DebuggerGlobalScope.webidl
new file mode 100644
index 00000000000..9035f7a40a2
--- /dev/null
+++ b/components/script_bindings/webidls/DebuggerGlobalScope.webidl
@@ -0,0 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+[Global=DebuggerGlobalScope, Exposed=DebuggerGlobalScope]
+interface DebuggerGlobalScope: GlobalScope {
+};
diff --git a/components/script_bindings/webidls/EventTarget.webidl b/components/script_bindings/webidls/EventTarget.webidl
index a8a63cc2b32..411fb962d32 100644
--- a/components/script_bindings/webidls/EventTarget.webidl
+++ b/components/script_bindings/webidls/EventTarget.webidl
@@ -5,7 +5,7 @@
  * https://dom.spec.whatwg.org/#interface-eventtarget
  */
 
-[Exposed=(Window,Worker,Worklet,DissimilarOriginWindow)]
+[Exposed=(Window,Worker,Worklet,DissimilarOriginWindow,DebuggerGlobalScope)]
 interface EventTarget {
   [Throws] constructor();
   undefined addEventListener(
diff --git a/components/script_bindings/webidls/GlobalScope.webidl b/components/script_bindings/webidls/GlobalScope.webidl
index 57206d13e6a..dfa44738781 100644
--- a/components/script_bindings/webidls/GlobalScope.webidl
+++ b/components/script_bindings/webidls/GlobalScope.webidl
@@ -5,6 +5,6 @@
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 
-[Exposed=(Window,Worker,Worklet,DissimilarOriginWindow),
+[Exposed=(Window,Worker,Worklet,DissimilarOriginWindow,DebuggerGlobalScope),
  Inline]
 interface GlobalScope : EventTarget {};