diff --git a/components/net/cookie.rs b/components/net/cookie.rs
index 35c5d4dbe73..dfca6912c94 100644
--- a/components/net/cookie.rs
+++ b/components/net/cookie.rs
@@ -100,7 +100,7 @@ impl Cookie {
            request_path.chars().filter(|&c| c == '/').count() == 1 {
             "/".to_owned()
         } else if request_path.ends_with("/") {
-            request_path.slice_to(request_path.len()-1).to_owned()
+            request_path[..request_path.len() - 1].to_owned()
         } else {
             request_path.to_owned()
         }
diff --git a/components/net/data_loader.rs b/components/net/data_loader.rs
index 987b39568f3..bdaca050477 100644
--- a/components/net/data_loader.rs
+++ b/components/net/data_loader.rs
@@ -55,7 +55,7 @@ fn load(load_data: LoadData, start_chan: Sender<TargetedLoadResponse>) {
     let mut ct_str = parts[0];
     if ct_str.ends_with(";base64") {
         is_base64 = true;
-        ct_str = ct_str.slice_to(ct_str.as_bytes().len() - 7);
+        ct_str = &ct_str[..ct_str.as_bytes().len() - 7];
     }
 
     // Parse the content type using rust-http.
diff --git a/components/net/http_loader.rs b/components/net/http_loader.rs
index b23450c38df..9cb33763866 100644
--- a/components/net/http_loader.rs
+++ b/components/net/http_loader.rs
@@ -126,7 +126,7 @@ reason: \"certificate verify failed\" }]";
         req.headers_mut().set(host);
 
         let (tx, rx) = channel();
-        cookies_chan.send(ControlMsg::GetCookiesForUrl(url.clone(), tx, CookieSource::HTTP));
+        cookies_chan.send(ControlMsg::GetCookiesForUrl(url.clone(), tx, CookieSource::HTTP)).unwrap();
         if let Some(cookie_list) = rx.recv().unwrap() {
             let mut v = Vec::new();
             v.push(cookie_list.into_bytes());
@@ -157,7 +157,7 @@ reason: \"certificate verify failed\" }]";
                         return;
                     }
                 };
-                match writer.write(data.as_slice()) {
+                match writer.write_all(&*data) {
                     Err(e) => {
                         send_error(url, e.desc.to_string(), senders);
                         return;
@@ -201,7 +201,7 @@ reason: \"certificate verify failed\" }]";
                 if let Ok(cookies) = String::from_utf8(cookie.clone()) {
                     cookies_chan.send(ControlMsg::SetCookiesForUrl(url.clone(),
                                                                    cookies,
-                                                                   CookieSource::HTTP));
+                                                                   CookieSource::HTTP)).unwrap();
                 }
             }
         }
diff --git a/components/net/lib.rs b/components/net/lib.rs
index 4beb588047c..45a6c4c114e 100644
--- a/components/net/lib.rs
+++ b/components/net/lib.rs
@@ -2,12 +2,18 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(int_uint)]
-#![feature(unboxed_closures)]
 #![feature(box_syntax)]
+#![feature(collections)]
+#![feature(core)]
+#![feature(env)]
+#![feature(int_uint)]
+#![feature(io)]
+#![feature(path)]
+#![feature(rustc_private)]
+#![feature(std_misc)]
+#![feature(unboxed_closures)]
 
 #![allow(missing_copy_implementations)]
-#![allow(unstable)]
 
 extern crate "cookie" as cookie_rs;
 extern crate collections;
diff --git a/components/net/resource_task.rs b/components/net/resource_task.rs
index b8c7190ebd9..c6f6414f125 100644
--- a/components/net/resource_task.rs
+++ b/components/net/resource_task.rs
@@ -23,12 +23,12 @@ use hyper::mime::{Mime, Attr};
 use url::Url;
 
 use std::borrow::{ToOwned, IntoCow};
+use std::collections::HashMap;
+use std::env;
+use std::mem;
+use std::old_io::{BufferedReader, File};
 use std::sync::mpsc::{channel, Receiver, Sender};
 use std::thunk::Invoke;
-use std::collections::HashMap;
-use std::old_io::{BufferedReader, File};
-use std::mem;
-use std::os;
 
 #[cfg(test)]
 use std::old_io::{Listener, Acceptor, TimedOut};
@@ -38,7 +38,7 @@ use std::old_io::net::tcp::TcpListener;
 static mut HOST_TABLE: Option<*mut HashMap<String, String>> = None;
 
 pub fn global_init() {
-    if let Some(host_file_path) = os::getenv("HOST_FILE") {
+    if let Ok(host_file_path) = env::var_string("HOST_FILE") {
         //TODO: handle bad file path and corrupted file
         let path = Path::new(host_file_path);
         let mut file = BufferedReader::new(File::open(&path));
@@ -291,7 +291,7 @@ impl ResourceManager {
                 }
               }
               ControlMsg::GetCookiesForUrl(url, consumer, source) => {
-                consumer.send(self.cookie_storage.cookies_for_url(&url, source));
+                consumer.send(self.cookie_storage.cookies_for_url(&url, source)).unwrap();
               }
               ControlMsg::Exit => {
                 break