diff --git a/components/style/gecko/generated/bindings.rs b/components/style/gecko/generated/bindings.rs
index c365ff677a1..13fe500e0c4 100644
--- a/components/style/gecko/generated/bindings.rs
+++ b/components/style/gecko/generated/bindings.rs
@@ -250,16 +250,16 @@ pub type RawServoSupportsRuleBorrowed<'a> = &'a RawServoSupportsRule;
 pub type RawServoSupportsRuleBorrowedOrNull<'a> = Option<&'a RawServoSupportsRule>;
 enum RawServoSupportsRuleVoid { }
 pub struct RawServoSupportsRule(RawServoSupportsRuleVoid);
-pub type RawServoRuleNodeStrong = ::gecko_bindings::sugar::ownership::Strong<RawServoRuleNode>;
-pub type RawServoRuleNodeBorrowed<'a> = &'a RawServoRuleNode;
-pub type RawServoRuleNodeBorrowedOrNull<'a> = Option<&'a RawServoRuleNode>;
-enum RawServoRuleNodeVoid { }
-pub struct RawServoRuleNode(RawServoRuleNodeVoid);
 pub type RawServoDocumentRuleStrong = ::gecko_bindings::sugar::ownership::Strong<RawServoDocumentRule>;
 pub type RawServoDocumentRuleBorrowed<'a> = &'a RawServoDocumentRule;
 pub type RawServoDocumentRuleBorrowedOrNull<'a> = Option<&'a RawServoDocumentRule>;
 enum RawServoDocumentRuleVoid { }
 pub struct RawServoDocumentRule(RawServoDocumentRuleVoid);
+pub type RawServoRuleNodeStrong = ::gecko_bindings::sugar::ownership::Strong<RawServoRuleNode>;
+pub type RawServoRuleNodeBorrowed<'a> = &'a RawServoRuleNode;
+pub type RawServoRuleNodeBorrowedOrNull<'a> = Option<&'a RawServoRuleNode>;
+enum RawServoRuleNodeVoid { }
+pub struct RawServoRuleNode(RawServoRuleNodeVoid);
 pub type RawServoStyleSetOwned = ::gecko_bindings::sugar::ownership::Owned<RawServoStyleSet>;
 pub type RawServoStyleSetOwnedOrNull = ::gecko_bindings::sugar::ownership::OwnedOrNull<RawServoStyleSet>;
 pub type RawServoStyleSetBorrowed<'a> = &'a RawServoStyleSet;
@@ -421,18 +421,18 @@ extern "C" {
 extern "C" {
     pub fn Servo_SupportsRule_Release(ptr: RawServoSupportsRuleBorrowed);
 }
-extern "C" {
-    pub fn Servo_RuleNode_AddRef(ptr: RawServoRuleNodeBorrowed);
-}
-extern "C" {
-    pub fn Servo_RuleNode_Release(ptr: RawServoRuleNodeBorrowed);
-}
 extern "C" {
     pub fn Servo_DocumentRule_AddRef(ptr: RawServoDocumentRuleBorrowed);
 }
 extern "C" {
     pub fn Servo_DocumentRule_Release(ptr: RawServoDocumentRuleBorrowed);
 }
+extern "C" {
+    pub fn Servo_RuleNode_AddRef(ptr: RawServoRuleNodeBorrowed);
+}
+extern "C" {
+    pub fn Servo_RuleNode_Release(ptr: RawServoRuleNodeBorrowed);
+}
 extern "C" {
     pub fn Servo_StyleSet_Drop(ptr: RawServoStyleSetOwned);
 }
@@ -1587,6 +1587,9 @@ extern "C" {
                                                      URLMatchingFunction)
      -> bool;
 }
+extern "C" {
+    pub fn Gecko_SetJemallocThreadLocalArena(enabled: bool);
+}
 extern "C" {
     pub fn Servo_Element_ClearData(node: RawGeckoElementBorrowed);
 }
diff --git a/components/style/gecko/global_style_data.rs b/components/style/gecko/global_style_data.rs
index b1f62b0eac0..3cbace9b90a 100644
--- a/components/style/gecko/global_style_data.rs
+++ b/components/style/gecko/global_style_data.rs
@@ -6,6 +6,7 @@
 
 use context::StyleSystemOptions;
 use gecko_bindings::bindings::{Gecko_RegisterProfilerThread, Gecko_UnregisterProfilerThread};
+use gecko_bindings::bindings::Gecko_SetJemallocThreadLocalArena;
 use num_cpus;
 use rayon;
 use shared_lock::SharedRwLock;
@@ -33,6 +34,9 @@ fn thread_name(index: usize) -> String {
 }
 
 fn thread_startup(index: usize) {
+    unsafe {
+        Gecko_SetJemallocThreadLocalArena(true);
+    }
     let name = thread_name(index);
     let name = CString::new(name).unwrap();
     unsafe {
@@ -44,6 +48,7 @@ fn thread_startup(index: usize) {
 fn thread_shutdown(_: usize) {
     unsafe {
         Gecko_UnregisterProfilerThread();
+        Gecko_SetJemallocThreadLocalArena(false);
     }
 }