diff --git a/Cargo.lock b/Cargo.lock
index 43c64bcd7e2..0252ff2c591 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,7 +3,6 @@ name = "servo"
 version = "0.0.1"
 dependencies = [
  "compositing 0.0.1",
- "devtools 0.0.1",
  "gfx 0.0.1",
  "layout 0.0.1",
  "msg 0.0.1",
@@ -113,11 +112,15 @@ name = "devtools"
 version = "0.0.1"
 dependencies = [
  "devtools_traits 0.0.1",
+ "msg 0.0.1",
 ]
 
 [[package]]
 name = "devtools_traits"
 version = "0.0.1"
+dependencies = [
+ "msg 0.0.1",
+]
 
 [[package]]
 name = "egl"
diff --git a/Cargo.toml b/Cargo.toml
index 0561ad480f0..2472f99be99 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,8 +46,5 @@ path = "components/layout"
 [dependencies.gfx]
 path = "components/gfx"
 
-[dependencies.devtools]
-path = "components/devtools"
-
 [dependencies.url]
 git = "https://github.com/servo/rust-url"
diff --git a/components/devtools/Cargo.toml b/components/devtools/Cargo.toml
index d27e6bfed5a..2984f9daf61 100644
--- a/components/devtools/Cargo.toml
+++ b/components/devtools/Cargo.toml
@@ -6,7 +6,9 @@ authors = ["The Servo Project Developers"]
 [lib]
 name = "devtools"
 path = "lib.rs"
-crate-type = ["dylib"]
 
 [dependencies.devtools_traits]
 path = "../devtools_traits"
+
+[dependencies.msg]
+path = "../msg"
diff --git a/components/devtools/lib.rs b/components/devtools/lib.rs
index 991ddeb5376..d00544026e9 100644
--- a/components/devtools/lib.rs
+++ b/components/devtools/lib.rs
@@ -21,19 +21,26 @@ extern crate debug;
 extern crate std;
 extern crate serialize;
 extern crate sync;
+extern crate servo_msg = "msg";
 
-use devtools_traits::{ServerExitMsg, DevtoolsControlMsg, NewGlobal};
+use devtools_traits::{ServerExitMsg, DevtoolsControlMsg, NewGlobal, DevtoolScriptControlMsg};
+use devtools_traits::{EvaluateJS, NullValue, VoidValue, NumberValue, StringValue, BooleanValue};
+use devtools_traits::ActorValue;
+use servo_msg::constellation_msg::PipelineId;
 
 use collections::TreeMap;
-use std::any::{Any, AnyRefExt};
+use std::any::{Any, AnyRefExt, AnyMutRefExt};
 use std::collections::hashmap::HashMap;
 use std::comm;
 use std::comm::{Disconnected, Empty};
 use std::io::{TcpListener, TcpStream};
 use std::io::{Acceptor, Listener, EndOfFile, IoError, TimedOut};
+use std::mem::{transmute, transmute_copy};
 use std::num;
+use std::raw::TraitObject;
 use std::task::TaskBuilder;
 use serialize::{json, Encodable};
+use serialize::json::ToJson;
 use sync::{Arc, Mutex};
 
 #[deriving(Encodable)]
@@ -49,6 +56,7 @@ struct RootActorMsg {
 }
 
 struct RootActor {
+    next: u32,
     tabs: Vec<String>,
 }
 
@@ -74,6 +82,12 @@ struct TabActor {
     url: String,
 }
 
+struct ConsoleActor {
+    name: String,
+    pipeline: PipelineId,
+    script_chan: Sender<DevtoolScriptControlMsg>,
+}
+
 #[deriving(Encodable)]
 struct ListTabsReply {
     from: String,
@@ -82,16 +96,14 @@ struct ListTabsReply {
 }
 
 #[deriving(Encodable)]
-struct TabTraits {
-    reconfigure: bool,
-}
+struct TabTraits;
 
 #[deriving(Encodable)]
 struct TabAttachedReply {
     from: String,
     __type__: String,
     threadActor: String,
-    cacheEnabled: bool,
+    cacheDisabled: bool,
     javascriptEnabled: bool,
     traits: TabTraits,
 }
@@ -102,11 +114,18 @@ struct TabDetachedReply {
     __type__: String,
 }
 
+
+#[deriving(Encodable)]
+struct StartedListenersTraits {
+    customNetworkRequest: bool,
+}
+
 #[deriving(Encodable)]
 struct StartedListenersReply {
     from: String,
     nativeConsoleAPI: bool,
     startedListeners: Vec<String>,
+    traits: StartedListenersTraits,
 }
 
 #[deriving(Encodable)]
@@ -186,13 +205,24 @@ impl ActorRegistry {
         }
     }
 
-    fn register(&mut self, actor: Box<Actor+Send+Sized>) {
+    fn register<T: 'static>(&mut self, actor: Box<Actor+Send+Sized>) {
+        /*{
+            let actor2: &Actor+Send+Sized = actor;
+            assert!((actor2 as &Any).is::<T>());
+        };*/
         self.actors.insert(actor.name().to_string(), actor);
     }
 
     fn find<'a, T: 'static>(&'a self, name: &str) -> &'a T {
-        let actor: &Actor+Send+Sized = *self.actors.find(&name.to_string()).unwrap();
-        (actor as &Any).downcast_ref::<T>().unwrap()
+        /*let actor: &Actor+Send+Sized = *self.actors.find(&name.to_string()).unwrap();
+        (actor as &Any).downcast_ref::<T>().unwrap()*/
+        self.actors.find(&name.to_string()).unwrap().as_ref::<T>().unwrap()
+    }
+
+    fn find_mut<'a, T: 'static>(&'a mut self, name: &str) -> &'a mut T {
+        /*let actor: &mut Actor+Send+Sized = *self.actors.find_mut(&name.to_string()).unwrap();
+        (actor as &mut Any).downcast_mut::<T>().unwrap()*/
+        self.actors.find_mut(&name.to_string()).unwrap().downcast_mut::<T>().unwrap()
     }
 
     fn handle_message(&self, msg: &json::Object, stream: &mut TcpStream) {
@@ -220,6 +250,45 @@ trait Actor: Any {
     fn name(&self) -> String;
 }
 
+impl<'a> AnyMutRefExt<'a> for &'a mut Actor {
+    fn downcast_mut<T: 'static>(self) -> Option<&'a mut T> {
+        if self.is::<T>() {
+            unsafe {
+                // Get the raw representation of the trait object
+                let to: TraitObject = transmute_copy(&self);
+
+                // Extract the data pointer
+                Some(transmute(to.data))
+            }
+        } else {
+            None
+        }
+    }
+}
+
+impl<'a> AnyRefExt<'a> for &'a Actor {
+    fn is<T: 'static>(self) -> bool {
+        /*let t = TypeId::of::<T>();
+        let boxed = self.get_type_id();
+        t == boxed*/
+        true
+    }
+
+    fn downcast_ref<T: 'static>(self) -> Option<&'a T> {
+        if self.is::<T>() {
+            unsafe {
+                // Get the raw representation of the trait object
+                let to: TraitObject = transmute_copy(&self);
+
+                // Extract the data pointer
+                Some(transmute(to.data))
+            }
+        } else {
+            None
+        }
+    }
+}
+
 impl Actor for RootActor {
     fn name(&self) -> String {
         "root".to_string()
@@ -268,6 +337,11 @@ impl RootActor {
     }
 }
 
+#[deriving(Encodable)]
+struct ReconfigureReply {
+    from: String
+}
+
 impl Actor for TabActor {
     fn name(&self) -> String {
         self.name.clone()
@@ -276,19 +350,21 @@ impl Actor for TabActor {
     fn handle_message(&self,
                       _registry: &ActorRegistry,
                       msg_type: &String,
-                      msg: &json::Object,
+                      _msg: &json::Object,
                       stream: &mut TcpStream) -> bool {
         match msg_type.as_slice() {
+            "reconfigure" => {
+                stream.write_json_packet(&ReconfigureReply { from: self.name() });
+                true
+            }
             "attach" => {
                 let msg = TabAttachedReply {
                     from: self.name(),
                     __type__: "tabAttached".to_string(),
                     threadActor: self.name(),
-                    cacheEnabled: false,
+                    cacheDisabled: false,
                     javascriptEnabled: true,
-                    traits: TabTraits {
-                        reconfigure: true,
-                    },
+                    traits: TabTraits,
                 };
                 stream.write_json_packet(&msg);
                 true
@@ -301,16 +377,34 @@ impl Actor for TabActor {
                 stream.write_json_packet(&msg);
                 true
             }
-            "startListeners" => {
-                let msg = StartedListenersReply {
-                    from: self.name(),
-                    nativeConsoleAPI: true,
-                    startedListeners:
-                        vec!("PageError".to_string(), "ConsoleAPI".to_string()),
-                };
-                stream.write_json_packet(&msg);
-                true
-            }
+            _ => false
+        }
+    }
+}
+
+impl TabActor {
+    fn encodable(&self) -> TabActorMsg {
+        TabActorMsg {
+            actor: self.name(),
+            title: self.title.clone(),
+            url: self.url.clone(),
+            outerWindowID: 0,
+            consoleActor: "console0".to_string(),
+        }
+    }
+}
+
+impl Actor for ConsoleActor {
+    fn name(&self) -> String {
+        self.name.clone()
+    }
+
+    fn handle_message(&self,
+                      _registry: &ActorRegistry,
+                      msg_type: &String,
+                      msg: &json::Object,
+                      stream: &mut TcpStream) -> bool {
+        match msg_type.as_slice() {
             "getCachedMessages" => {
                 let types = msg.find(&"messageTypes".to_string()).unwrap().as_list().unwrap();
                 let mut messages = vec!();
@@ -356,6 +450,20 @@ impl Actor for TabActor {
                 stream.write_json_packet(&msg);
                 true
             }
+            "startListeners" => {
+                let msg = StartedListenersReply {
+                    from: self.name(),
+                    nativeConsoleAPI: true,
+                    startedListeners:
+                        vec!("PageError".to_string(), "ConsoleAPI".to_string(),
+                             "NetworkActivity".to_string(), "FileActivity".to_string()),
+                    traits: StartedListenersTraits {
+                        customNetworkRequest: true,
+                    }
+                };
+                stream.write_json_packet(&msg);
+                true
+            }
             "stopListeners" => {
                 let msg = StopListenersReply {
                     from: self.name(),
@@ -380,10 +488,60 @@ impl Actor for TabActor {
                 true
             }
             "evaluateJS" => {
+                let input = msg.find(&"text".to_string()).unwrap().as_string().unwrap().to_string();
+                let (chan, port) = channel();
+                self.script_chan.send(EvaluateJS(self.pipeline, input.clone(), chan));
+
+                let result = match port.recv() {
+                    VoidValue => {
+                        let mut m = TreeMap::new();
+                        m.insert("type".to_string(), "undefined".to_string().to_json());
+                        json::Object(m)
+                    }
+                    NullValue => {
+                        let mut m = TreeMap::new();
+                        m.insert("type".to_string(), "null".to_string().to_json());
+                        json::Object(m)
+                    }
+                    BooleanValue(val) => val.to_json(),
+                    NumberValue(val) => {
+                        if val.is_nan() {
+                            let mut m = TreeMap::new();
+                            m.insert("type".to_string(), "NaN".to_string().to_json());
+                            json::Object(m)
+                        } else if val.is_infinite() {
+                            let mut m = TreeMap::new();
+                            if val < 0. {
+                                m.insert("type".to_string(), "Infinity".to_string().to_json());
+                            } else {
+                                m.insert("type".to_string(), "-Infinity".to_string().to_json());
+                            }
+                            json::Object(m)
+                        } else if val == Float::neg_zero() {
+                            let mut m = TreeMap::new();
+                            m.insert("type".to_string(), "-0".to_string().to_json());
+                            json::Object(m)
+                        } else {
+                            val.to_json()
+                        }
+                    }
+                    StringValue(s) => s.to_json(),
+                    ActorValue(s) => {
+                        let mut m = TreeMap::new();
+                        m.insert("type".to_string(), "object".to_string().to_json());
+                        m.insert("class".to_string(), "???".to_string().to_json());
+                        m.insert("actor".to_string(), s.to_json());
+                        m.insert("extensible".to_string(), true.to_json());
+                        m.insert("frozen".to_string(), false.to_json());
+                        m.insert("sealed".to_string(), false.to_json());
+                        json::Object(m)
+                    }
+                };
+
                 let msg = EvaluateJSReply {
                     from: self.name(),
-                    input: msg.find(&"text".to_string()).unwrap().as_string().unwrap().to_string(),
-                    result: json::Object(TreeMap::new()),
+                    input: input,
+                    result: result,
                     timestamp: 0,
                     exception: json::Object(TreeMap::new()),
                     exceptionMessage: "".to_string(),
@@ -397,18 +555,6 @@ impl Actor for TabActor {
     }
 }
 
-impl TabActor {
-    fn encodable(&self) -> TabActorMsg {
-        TabActorMsg {
-            actor: self.name(),
-            title: self.title.clone(),
-            url: self.url.clone(),
-            outerWindowID: 0,
-            consoleActor: self.name(),
-        }
-    }
-}
-
 trait JsonPacketSender {
     fn write_json_packet<'a, T: Encodable<json::Encoder<'a>,IoError>>(&mut self, obj: &T);
 }
@@ -442,18 +588,13 @@ fn run_server(port: Receiver<DevtoolsControlMsg>) {
 
     let mut registry = ActorRegistry::new();
 
-    let tab = box TabActor {
-        name: "tab1".to_string(),
-        title: "Performing Layout".to_string(),
-        url: "about-mozilla.html".to_string(),
-    };
-
     let root = box RootActor {
-        tabs: vec!(tab.name().to_string()),
+        next: 0,
+        tabs: vec!(),
     };
 
-    registry.register(tab);
-    registry.register(root);
+    registry.register::<RootActor>(root);
+    registry.find::<RootActor>("root");
 
     let actors = Arc::new(Mutex::new(registry));
 
@@ -496,13 +637,41 @@ fn run_server(port: Receiver<DevtoolsControlMsg>) {
         }
     }
 
+    fn handle_new_global(actors: Arc<Mutex<ActorRegistry>>,
+                         pipeline: PipelineId,
+                         sender: Sender<DevtoolScriptControlMsg>) {
+        {
+            let mut actors = actors.lock();
+
+            let (tab, console) = {
+                let root = actors.find_mut::<RootActor>("root");
+
+                let tab = TabActor {
+                    name: format!("tab{}", root.next),
+                    title: "".to_string(),
+                    url: "about:blank".to_string(),
+                };
+                let console = ConsoleActor {
+                    name: format!("console{}", root.next),
+                    script_chan: sender,
+                    pipeline: pipeline,
+                };
+                root.next += 1;
+                root.tabs.push(tab.name.clone());
+                (tab, console)
+            };
+            actors.register::<TabActor>(box tab);
+            actors.register::<ConsoleActor>(box console);
+        }
+    }
+
     // accept connections and process them, spawning a new tasks for each one
     for stream in acceptor.incoming() {
         match stream {
             Err(ref e) if e.kind == TimedOut => {
                 match port.try_recv() {
                     Ok(ServerExitMsg) | Err(Disconnected) => break,
-                    Ok(NewGlobal(_)) => { /*TODO*/ },
+                    Ok(NewGlobal(id, sender)) => handle_new_global(actors.clone(), id, sender),
                     Err(Empty) => acceptor.set_timeout(Some(POLL_TIMEOUT)),
                 }
             }
diff --git a/components/devtools_traits/Cargo.toml b/components/devtools_traits/Cargo.toml
index ee897936dbb..c3ea63b06fa 100644
--- a/components/devtools_traits/Cargo.toml
+++ b/components/devtools_traits/Cargo.toml
@@ -6,3 +6,6 @@ authors = ["The Servo Project Developers"]
 [lib]
 name = "devtools_traits"
 path = "lib.rs"
+
+[dependencies.msg]
+path = "../msg"
diff --git a/components/devtools_traits/lib.rs b/components/devtools_traits/lib.rs
index 823acd0ab8f..08a061708ee 100644
--- a/components/devtools_traits/lib.rs
+++ b/components/devtools_traits/lib.rs
@@ -8,24 +8,29 @@
 #![comment = "The Servo Parallel Browser Project"]
 #![license = "MPL"]
 
+extern crate servo_msg = "msg";
+
+use servo_msg::constellation_msg::PipelineId;
+
 pub type DevtoolsControlChan = Sender<DevtoolsControlMsg>;
 pub type DevtoolsControlPort = Receiver<DevtoolScriptControlMsg>;
 
 pub enum DevtoolsControlMsg {
-    NewGlobal(Sender<DevtoolScriptControlMsg>),
+    NewGlobal(PipelineId, Sender<DevtoolScriptControlMsg>),
     ServerExitMsg
 }
 
 pub enum EvaluateJSReply {
     VoidValue,
     NullValue,
+    BooleanValue(bool),
     NumberValue(f64),
     StringValue(String),
     ActorValue(String),
 }
 
 pub enum DevtoolScriptControlMsg {
-    EvaluateJS(String, Sender<EvaluateJSReply>),
+    EvaluateJS(PipelineId, String, Sender<EvaluateJSReply>),
 }
 
 pub enum ScriptDevtoolControlMsg {
diff --git a/components/script/script_task.rs b/components/script/script_task.rs
index 20f5eb3ded5..02fa3d10921 100644
--- a/components/script/script_task.rs
+++ b/components/script/script_task.rs
@@ -6,6 +6,7 @@
 //! and layout tasks.
 
 use dom::bindings::codegen::InheritTypes::{EventTargetCast, NodeCast, EventCast};
+use dom::bindings::conversions;
 use dom::bindings::conversions::{FromJSValConvertible, Empty};
 use dom::bindings::global::Window;
 use dom::bindings::js::{JS, JSRef, RootCollection, Temporary, OptionalSettable};
@@ -31,8 +32,9 @@ use layout_interface::ContentChangedDocumentDamage;
 use layout_interface;
 use page::{Page, IterablePage, Frame};
 
+use devtools_traits;
 use devtools_traits::{DevtoolsControlChan, DevtoolsControlPort, NewGlobal};
-use devtools_traits::{DevtoolScriptControlMsg, EvaluateJS};
+use devtools_traits::{DevtoolScriptControlMsg, EvaluateJS, EvaluateJSReply};
 use script_traits::{CompositorEvent, ResizeEvent, ReflowEvent, ClickEvent, MouseDownEvent};
 use script_traits::{MouseMoveEvent, MouseUpEvent, ConstellationControlMsg, ScriptTaskFactory};
 use script_traits::{ResizeMsg, AttachLayoutMsg, LoadMsg, SendEventMsg, ResizeInactiveMsg};
@@ -315,7 +317,7 @@ impl ScriptTask {
         //FIXME: Move this into handle_load after we create a window instead.
         let (devtools_sender, devtools_receiver) = channel();
         devtools_chan.as_ref().map(|chan| {
-            chan.send(NewGlobal(devtools_sender.clone()));
+            chan.send(NewGlobal(id, devtools_sender.clone()));
         });
 
         Rc::new(ScriptTask {
@@ -496,13 +498,36 @@ impl ScriptTask {
                 FromScript(DOMMessage(..)) => fail!("unexpected message"),
                 FromScript(WorkerPostMessage(addr, data, nbytes)) => Worker::handle_message(addr, data, nbytes),
                 FromScript(WorkerRelease(addr)) => Worker::handle_release(addr),
-                FromDevtools(EvaluateJS(_s, _reply)) => {/*TODO*/}
+                FromDevtools(EvaluateJS(id, s, reply)) => self.handle_evaluate_js(id, s, reply),
             }
         }
 
         true
     }
 
+    fn handle_evaluate_js(&self, pipeline: PipelineId, eval: String, reply: Sender<EvaluateJSReply>) {
+        let page = get_page(&*self.page.borrow(), pipeline);
+        let frame = page.frame();
+        let window = frame.get_ref().window.root();
+        let cx = window.get_cx();
+        let rval = window.evaluate_js_with_result(eval.as_slice());
+
+        reply.send(if rval.is_undefined() {
+            devtools_traits::VoidValue
+        } else if rval.is_boolean() {
+            devtools_traits::BooleanValue(rval.to_boolean())
+        } else if rval.is_double() {
+            devtools_traits::NumberValue(FromJSValConvertible::from_jsval(cx, rval, ()).unwrap())
+        } else if rval.is_string() {
+            //FIXME: use jsstring_to_str when jsval grows to_jsstring
+            devtools_traits::StringValue(FromJSValConvertible::from_jsval(cx, rval, conversions::Default).unwrap())
+        } else {
+            //FIXME: jsvals don't have an is_int32/is_number yet
+            assert!(rval.is_object_or_null());
+            fail!("object values unimplemented")
+        });
+    }
+
     fn handle_new_layout(&self, new_layout_info: NewLayoutInfo) {
         debug!("Script: new layout: {:?}", new_layout_info);
         let NewLayoutInfo {