diff --git a/components/devtools/lib.rs b/components/devtools/lib.rs
index 63e4c7aea15..cc37ed7c4b0 100644
--- a/components/devtools/lib.rs
+++ b/components/devtools/lib.rs
@@ -307,7 +307,7 @@ fn run_server(
             let worker = WorkerActor {
                 name: actors.new_name("worker"),
                 console: console.name(),
-                id: id,
+                id: id.clone(),
             };
             actor_workers.insert((pipeline, id), worker.name.clone());
             actors.register(Box::new(worker));
diff --git a/components/devtools_traits/lib.rs b/components/devtools_traits/lib.rs
index 0e0872e7663..c71693dff40 100644
--- a/components/devtools_traits/lib.rs
+++ b/components/devtools_traits/lib.rs
@@ -25,6 +25,7 @@ use msg::constellation_msg::PipelineId;
 use servo_url::ServoUrl;
 use std::net::TcpStream;
 use time::{self, Duration, Tm};
+//use uuid::Uuid;
 
 // Information would be attached to NewGlobal to be received and show in devtools.
 // Extend these fields if we need more information.
@@ -356,5 +357,5 @@ impl PreciseTime {
     }
 }
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, PartialEq, Serialize)]
-pub struct WorkerId(pub u32);
+#[derive(Clone, Debug, Deserialize, Eq, Hash, MallocSizeOf, PartialEq, Serialize)]
+pub struct WorkerId(pub String);
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index cfa02f3363e..3889402a346 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -110,7 +110,7 @@ time = "0.1.12"
 unicode-segmentation = "1.1.0"
 url = "2.0"
 utf-8 = "0.7"
-uuid = {version = "0.8", features = ["v4"]}
+uuid = {version = "0.8", features = ["v4", "serde"]}
 xml5ever = "0.16"
 webdriver = "0.40"
 webgpu = {path = "../webgpu"}
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 8af14654342..067cf6cc009 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -80,6 +80,7 @@ use std::rc::Rc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
 use time::{get_time, Timespec};
+use uuid::Uuid;
 
 #[derive(JSTraceable)]
 pub struct AutoCloseWorker(Arc<AtomicBool>);
@@ -94,7 +95,7 @@ impl Drop for AutoCloseWorker {
 pub struct GlobalScope {
     eventtarget: EventTarget,
     crypto: MutNullableDom<Crypto>,
-    next_worker_id: Cell<WorkerId>,
+    next_worker_id: WorkerId,
 
     /// The message-port router id for this global, if it is managing ports.
     message_port_state: DomRefCell<MessagePortState>,
@@ -347,7 +348,7 @@ impl GlobalScope {
             message_port_state: DomRefCell::new(MessagePortState::UnManaged),
             eventtarget: EventTarget::new_inherited(),
             crypto: Default::default(),
-            next_worker_id: Cell::new(WorkerId(0)),
+            next_worker_id: WorkerId(Uuid::new_v4().to_string()),
             pipeline_id,
             devtools_wants_updates: Default::default(),
             console_timers: DomRefCell::new(Default::default()),
@@ -928,9 +929,7 @@ impl GlobalScope {
 
     /// Get next worker id.
     pub fn get_next_worker_id(&self) -> WorkerId {
-        let worker_id = self.next_worker_id.get();
-        let WorkerId(id_num) = worker_id;
-        self.next_worker_id.set(WorkerId(id_num + 1));
+        let worker_id = self.next_worker_id.clone();
         worker_id
     }
 
diff --git a/components/script/serviceworker_manager.rs b/components/script/serviceworker_manager.rs
index 109628ae94e..4323ef45f59 100644
--- a/components/script/serviceworker_manager.rs
+++ b/components/script/serviceworker_manager.rs
@@ -98,8 +98,9 @@ impl ServiceWorkerManager {
                     title: title,
                     url: scope_things.script_url.clone(),
                 };
+                let worker_id = scope_things.worker_id.clone();
                 let _ = chan.send(ScriptToDevtoolsControlMsg::NewGlobal(
-                    (scope_things.init.pipeline_id, Some(scope_things.worker_id)),
+                    (scope_things.init.pipeline_id, Some(worker_id)),
                     devtools_sender,
                     page_info,
                 ));