diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 076b7bd642f..1e26bc68c2f 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2400,7 +2400,6 @@ class CGWrapMethod(CGAbstractMethod):
         if not self.descriptor.isGlobal():
             create = CreateBindingJSObject(self.descriptor, "scope")
             return CGGeneric("""\
-let _ar = JSAutoRequest::new(cx);
 let scope = scope.reflector().get_jsobject();
 assert!(!scope.get().is_null());
 assert!(((*JS_GetClass(scope.get())).flags & JSCLASS_IS_GLOBAL) != 0);
@@ -2419,7 +2418,6 @@ Root::from_ref(&*raw)""" % {'copyUnforgeable': unforgeable, 'createObject': crea
         else:
             create = CreateBindingJSObject(self.descriptor)
             return CGGeneric("""\
-let _ar = JSAutoRequest::new(cx);
 %(createObject)s
 
 let _ac = JSAutoCompartment::new(cx, obj.ptr);
@@ -5546,7 +5544,7 @@ class CGBindingRoot(CGThing):
             'js::jsapi::{JS_AtomizeAndPinString, JS_IsExceptionPending, JS_NewObject, JS_NewObjectWithGivenProto}',
             'js::jsapi::{JS_NewObjectWithoutMetadata, JS_NewStringCopyZ, JS_SetProperty}',
             'js::jsapi::{JS_SetPrototype, JS_SetReservedSlot, JS_WrapValue, JSAutoCompartment}',
-            'js::jsapi::{JSAutoRequest, JSContext, JSClass, JSFreeOp, JSFunctionSpec}',
+            'js::jsapi::{JSContext, JSClass, JSFreeOp, JSFunctionSpec}',
             'js::jsapi::{JSJitGetterCallArgs, JSJitInfo, JSJitMethodCallArgs, JSJitSetterCallArgs}',
             'js::jsapi::{JSNative, JSObject, JSNativeWrapper, JSPropertySpec}',
             'js::jsapi::{JSString, JSTracer, JSType, JSTypedMethodJitInfo, JSValueType}',
diff --git a/components/script/dom/browsingcontext.rs b/components/script/dom/browsingcontext.rs
index 0576c165cc0..0371950300c 100644
--- a/components/script/dom/browsingcontext.rs
+++ b/components/script/dom/browsingcontext.rs
@@ -17,7 +17,7 @@ use dom::window::Window;
 use js::JSCLASS_IS_GLOBAL;
 use js::glue::{CreateWrapperProxyHandler, ProxyTraps, NewWindowProxy};
 use js::glue::{GetProxyPrivate, SetProxyExtra, GetProxyExtra};
-use js::jsapi::{Handle, HandleId, HandleObject, HandleValue, JSAutoCompartment, JSAutoRequest};
+use js::jsapi::{Handle, HandleId, HandleObject, HandleValue, JSAutoCompartment};
 use js::jsapi::{JSContext, JSPROP_READONLY, JSErrNum, JSObject, PropertyDescriptor, JS_DefinePropertyById};
 use js::jsapi::{JS_ForwardGetPropertyTo, JS_ForwardSetPropertyTo, JS_GetClass, JSTracer, FreeOp};
 use js::jsapi::{JS_GetOwnPropertyDescriptorById, JS_HasPropertyById, MutableHandle};
@@ -70,7 +70,6 @@ impl BrowsingContext {
             assert!(!handler.is_null());
 
             let cx = window.get_cx();
-            let _ar = JSAutoRequest::new(cx);
             let parent = window.reflector().get_jsobject();
             assert!(!parent.get().is_null());
             assert!(((*JS_GetClass(parent.get())).flags & JSCLASS_IS_GLOBAL) != 0);
diff --git a/components/script/dom/dedicatedworkerglobalscope.rs b/components/script/dom/dedicatedworkerglobalscope.rs
index bd8d1bdfd2d..c4351b278f2 100644
--- a/components/script/dom/dedicatedworkerglobalscope.rs
+++ b/components/script/dom/dedicatedworkerglobalscope.rs
@@ -23,7 +23,7 @@ use dom::workerglobalscope::WorkerGlobalScopeInit;
 use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
 use ipc_channel::router::ROUTER;
 use js::jsapi::{HandleValue, JS_SetInterruptCallback};
-use js::jsapi::{JSAutoCompartment, JSAutoRequest, JSContext, RootedValue};
+use js::jsapi::{JSAutoCompartment, JSContext, RootedValue};
 use js::jsval::UndefinedValue;
 use js::rust::Runtime;
 use msg::constellation_msg::PipelineId;
@@ -347,7 +347,6 @@ impl DedicatedWorkerGlobalScope {
             WorkerScriptMsg::DOMMessage(data) => {
                 let scope = self.upcast::<WorkerGlobalScope>();
                 let target = self.upcast();
-                let _ar = JSAutoRequest::new(scope.get_cx());
                 let _ac = JSAutoCompartment::new(scope.get_cx(),
                                                  scope.reflector().get_jsobject().get());
                 let mut message = RootedValue::new(scope.get_cx(), UndefinedValue());
diff --git a/components/script/dom/eventtarget.rs b/components/script/dom/eventtarget.rs
index 0b8325cf30d..3b492be7d4a 100644
--- a/components/script/dom/eventtarget.rs
+++ b/components/script/dom/eventtarget.rs
@@ -25,8 +25,7 @@ use dom::virtualmethods::VirtualMethods;
 use dom::window::Window;
 use fnv::FnvHasher;
 use heapsize::HeapSizeOf;
-use js::jsapi::{CompileFunction, JS_GetFunctionObject, RootedValue, RootedFunction};
-use js::jsapi::{JSAutoCompartment, JSAutoRequest};
+use js::jsapi::{CompileFunction, JS_GetFunctionObject, RootedValue, RootedFunction, JSAutoCompartment};
 use js::rust::{AutoObjectVectorWrapper, CompileOptionsWrapper};
 use libc::{c_char, size_t};
 use std::collections::HashMap;
@@ -422,7 +421,6 @@ impl EventTarget {
 
         let scopechain = AutoObjectVectorWrapper::new(cx);
 
-        let _ar = JSAutoRequest::new(cx);
         let _ac = JSAutoCompartment::new(cx, window.reflector().get_jsobject().get());
         let mut handler = RootedFunction::new(cx, ptr::null_mut());
         let rv = unsafe {
diff --git a/components/script/dom/htmliframeelement.rs b/components/script/dom/htmliframeelement.rs
index 59dc8673418..b3bc303b8b2 100644
--- a/components/script/dom/htmliframeelement.rs
+++ b/components/script/dom/htmliframeelement.rs
@@ -30,7 +30,7 @@ use dom::urlhelper::UrlHelper;
 use dom::virtualmethods::VirtualMethods;
 use dom::window::{ReflowReason, Window};
 use ipc_channel::ipc;
-use js::jsapi::{JSAutoCompartment, JSAutoRequest, RootedValue, JSContext, MutableHandleValue};
+use js::jsapi::{JSAutoCompartment, RootedValue, JSContext, MutableHandleValue};
 use js::jsval::{UndefinedValue, NullValue};
 use layout_interface::ReflowQueryType;
 use msg::constellation_msg::{ConstellationChan, LoadData};
@@ -162,7 +162,6 @@ impl HTMLIFrameElement {
             let window = window_from_node(self);
             let custom_event = unsafe {
                 let cx = window.get_cx();
-                let _ar = JSAutoRequest::new(cx);
                 let _ac = JSAutoCompartment::new(cx, window.reflector().get_jsobject().get());
                 let mut detail = RootedValue::new(cx, UndefinedValue());
                 let event_name = Atom::from(event.name());
diff --git a/components/script/dom/websocket.rs b/components/script/dom/websocket.rs
index 1145e188555..eb5ce8ab316 100644
--- a/components/script/dom/websocket.rs
+++ b/components/script/dom/websocket.rs
@@ -25,7 +25,7 @@ use dom::eventtarget::EventTarget;
 use dom::messageevent::MessageEvent;
 use dom::urlhelper::UrlHelper;
 use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
-use js::jsapi::{JSAutoCompartment, JSAutoRequest, RootedValue};
+use js::jsapi::{JSAutoCompartment, RootedValue};
 use js::jsapi::{JS_GetArrayBufferData, JS_NewArrayBuffer};
 use js::jsval::UndefinedValue;
 use libc::{uint32_t, uint8_t};
@@ -591,7 +591,6 @@ impl Runnable for MessageReceivedTask {
         // global.get_cx() returns a valid `JSContext` pointer, so this is safe.
         unsafe {
             let cx = global.r().get_cx();
-            let _ar = JSAutoRequest::new(cx);
             let _ac = JSAutoCompartment::new(cx, ws.reflector().get_jsobject().get());
             let mut message = RootedValue::new(cx, UndefinedValue());
             match self.message {
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 9f993c25461..1eae119b04f 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -37,7 +37,7 @@ use gfx_traits::LayerId;
 use ipc_channel::ipc::{self, IpcSender};
 use js::jsapi::{Evaluate2, MutableHandleValue};
 use js::jsapi::{HandleValue, JSContext};
-use js::jsapi::{JSAutoCompartment, JSAutoRequest, JS_GC, JS_GetRuntime, SetWindowProxy};
+use js::jsapi::{JSAutoCompartment, JS_GC, JS_GetRuntime, SetWindowProxy};
 use js::rust::CompileOptionsWrapper;
 use js::rust::Runtime;
 use layout_interface::{ContentBoxResponse, ContentBoxesResponse, ResolvedStyleResponse, ScriptReflow};
@@ -843,7 +843,6 @@ impl<'a, T: Reflectable> ScriptHelpers for &'a T {
                                              rval: MutableHandleValue) {
         let global = self.global();
         let cx = global.r().get_cx();
-        let _ar = JSAutoRequest::new(cx);
         let globalhandle = global.r().reflector().get_jsobject();
         let code: Vec<u16> = code.encode_utf16().collect();
         let filename = CString::new(filename).unwrap();
@@ -1216,7 +1215,6 @@ impl Window {
         self.browsing_context.set(Some(&browsing_context));
         let window = self.reflector().get_jsobject();
         let cx = self.get_cx();
-        let _ar = JSAutoRequest::new(cx);
         let _ac = JSAutoCompartment::new(cx, window.get());
         unsafe { SetWindowProxy(cx, window, browsing_context.reflector().get_jsobject()); }
     }
diff --git a/components/script/dom/worker.rs b/components/script/dom/worker.rs
index 2590cfba5e7..e15670fbefd 100644
--- a/components/script/dom/worker.rs
+++ b/components/script/dom/worker.rs
@@ -22,7 +22,7 @@ use dom::messageevent::MessageEvent;
 use dom::workerglobalscope::WorkerGlobalScopeInit;
 use ipc_channel::ipc;
 use js::jsapi::{HandleValue, JSContext, JSRuntime, RootedValue};
-use js::jsapi::{JSAutoCompartment, JSAutoRequest, JS_RequestInterruptCallback};
+use js::jsapi::{JSAutoCompartment, JS_RequestInterruptCallback};
 use js::jsval::UndefinedValue;
 use js::rust::Runtime;
 use script_runtime::ScriptChan;
@@ -133,7 +133,6 @@ impl Worker {
 
         let global = worker.r().global();
         let target = worker.upcast();
-        let _ar = JSAutoRequest::new(global.r().get_cx());
         let _ac = JSAutoCompartment::new(global.r().get_cx(), target.reflector().get_jsobject().get());
         let mut message = RootedValue::new(global.r().get_cx(), UndefinedValue());
         data.read(global.r(), message.handle_mut());
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index 5a4a2d9a7c8..f518c22890e 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -18,7 +18,7 @@ use dom::window::{base64_atob, base64_btoa};
 use dom::workerlocation::WorkerLocation;
 use dom::workernavigator::WorkerNavigator;
 use ipc_channel::ipc::IpcSender;
-use js::jsapi::{HandleValue, JSAutoRequest, JSContext, JSRuntime, RootedValue};
+use js::jsapi::{HandleValue, JSContext, JSRuntime, RootedValue};
 use js::jsval::UndefinedValue;
 use js::rust::Runtime;
 use msg::constellation_msg::{ConstellationChan, PipelineId};
@@ -329,7 +329,6 @@ impl WorkerGlobalScope {
                     // TODO: An error needs to be dispatched to the parent.
                     // https://github.com/servo/servo/issues/6422
                     println!("evaluate_script failed");
-                    let _ar = JSAutoRequest::new(self.runtime.cx());
                     report_pending_exception(self.runtime.cx(), self.reflector().get_jsobject().get());
                 }
             }
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 02f8d9a83ea..73350bed207 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -53,7 +53,7 @@ use ipc_channel::ipc::{self, IpcSender};
 use ipc_channel::router::ROUTER;
 use js::glue::GetWindowProxyClass;
 use js::jsapi::{DOMProxyShadowsResult, HandleId, HandleObject, RootedValue};
-use js::jsapi::{JSAutoRequest, JSContext, JS_SetWrapObjectCallbacks, JSTracer, SetWindowProxyClass};
+use js::jsapi::{JSContext, JS_SetWrapObjectCallbacks, JSTracer, SetWindowProxyClass};
 use js::jsval::UndefinedValue;
 use js::rust::Runtime;
 use layout_interface::{ReflowQueryType};
@@ -1576,7 +1576,6 @@ impl ScriptThread {
 
             // Turn javascript: URL into JS code to eval, according to the steps in
             // https://html.spec.whatwg.org/multipage/#javascript-protocol
-            let _ar = JSAutoRequest::new(self.get_cx());
 
             // This slice of the URL’s serialization is equivalent to (5.) to (7.):
             // Start with the scheme data of the parsed URL;
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index f7d8bf44037..4e1ff606783 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -1042,7 +1042,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.2"
-source = "git+https://github.com/servo/rust-mozjs#8ad6c1148fd77e5b9dc2ce0f0ab40d4f455f6f4e"
+source = "git+https://github.com/servo/rust-mozjs#2bcfb73419ca893156f48b8e7966f0fc492ccfa0"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index a9721a5c3b9..e158a1b6fdf 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -955,7 +955,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.2"
-source = "git+https://github.com/servo/rust-mozjs#8ad6c1148fd77e5b9dc2ce0f0ab40d4f455f6f4e"
+source = "git+https://github.com/servo/rust-mozjs#2bcfb73419ca893156f48b8e7966f0fc492ccfa0"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index d6bad36d3c0..28a5888b8b8 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -947,7 +947,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.2"
-source = "git+https://github.com/servo/rust-mozjs#8ad6c1148fd77e5b9dc2ce0f0ab40d4f455f6f4e"
+source = "git+https://github.com/servo/rust-mozjs#2bcfb73419ca893156f48b8e7966f0fc492ccfa0"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",