diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 67e473dee43..2401b46a388 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -108,7 +108,7 @@ jobs:
         PYTHON3: "C:\\mozilla-build\\python3\\python3.exe"
         LIBCLANG_PATH: "C:\\ProgramData\\scoop\\apps\\llvm\\current\\lib"
       run: |
-        cargo test --verbose ${{ matrix.features }} --lib
+        cargo test --verbose ${{ matrix.features }}
   Integrity:
     runs-on: ubuntu-latest
     steps:
diff --git a/mozjs/build.rs b/mozjs/build.rs
index 38128dd582c..aa43d646dab 100644
--- a/mozjs/build.rs
+++ b/mozjs/build.rs
@@ -387,6 +387,7 @@ const BLACKLIST_FUNCTIONS: &'static [&'static str] = &[
     "JS_GetPropertyDescriptor",
     "JS_GetUCPropertyDescriptor",
     "js::SetPropertyIgnoringNamedGetter",
+    "JS::FinishOffThreadStencil",
 ];
 
 /// Types that should be treated as an opaque blob of bytes whenever they show
diff --git a/rust-mozjs/Cargo.toml b/rust-mozjs/Cargo.toml
index 9920a7e369c..c31f41a3721 100644
--- a/rust-mozjs/Cargo.toml
+++ b/rust-mozjs/Cargo.toml
@@ -28,6 +28,8 @@ name = "enumerate"
 [[test]]
 name = "evaluate"
 [[test]]
+name = "offthread"
+[[test]]
 name = "panic"
 [[test]]
 name = "property_descriptor"
diff --git a/rust-mozjs/src/glue.rs b/rust-mozjs/src/glue.rs
index 7485dd8d96f..6eb7460d4ee 100644
--- a/rust-mozjs/src/glue.rs
+++ b/rust-mozjs/src/glue.rs
@@ -1,4 +1,5 @@
 use jsapi::*;
+use jsapi::js::frontend::CompilationStencil;
 use std::os::raw::{c_char, c_void};
 use std::{mem, ptr};
 
@@ -609,4 +610,10 @@ extern "C" {
         value: HandleValue,
         attrs: u32,
     );
+    pub fn FinishOffThreadStencil(
+        cx: *mut JSContext,
+        token: *mut OffThreadToken,
+        storage: *mut InstantiationStorage,
+        out: *mut already_AddRefed<CompilationStencil>,
+    );
 }
diff --git a/rust-mozjs/src/glue_wrappers.in b/rust-mozjs/src/glue_wrappers.in
index ccb8568d309..1208d133f92 100644
--- a/rust-mozjs/src/glue_wrappers.in
+++ b/rust-mozjs/src/glue_wrappers.in
@@ -19,4 +19,5 @@ wrap!(glue: pub fn JS_GetPromiseResult(promise: HandleObject, dest: MutableHandl
 wrap!(glue: pub fn JS_GetScriptPrivate(script: *mut JSScript, dest: MutableHandleValue));
 wrap!(glue: pub fn JS_GetModulePrivate(module: *mut JSObject, dest: MutableHandleValue));
 wrap!(glue: pub fn EncodeStringToUTF8(cx: *mut JSContext, str: HandleString, cb: fn(*const c_char)));
-wrap!(glue: pub fn SetDataPropertyDescriptor(desc: MutableHandle<PropertyDescriptor>, value: HandleValue, attrs: u32));
\ No newline at end of file
+wrap!(glue: pub fn SetDataPropertyDescriptor(desc: MutableHandle<PropertyDescriptor>, value: HandleValue, attrs: u32));
+wrap!(glue: pub fn FinishOffThreadStencil(cx: *mut JSContext, token: *mut OffThreadToken, storage: *mut InstantiationStorage, out: *mut already_AddRefed<CompilationStencil>));
diff --git a/rust-mozjs/src/jsglue.cpp b/rust-mozjs/src/jsglue.cpp
index 2af60efd76f..6108333a148 100644
--- a/rust-mozjs/src/jsglue.cpp
+++ b/rust-mozjs/src/jsglue.cpp
@@ -28,6 +28,7 @@
 #include "js/StructuredClone.h"
 #include "js/Wrapper.h"
 #include "js/experimental/JitInfo.h"
+#include "js/experimental/JSStencil.h"
 #include "js/experimental/TypedData.h"
 #include "js/friend/ErrorMessages.h"
 #include "jsapi.h"
@@ -1080,4 +1081,14 @@ void SetDataPropertyDescriptor(
   desc.set(JS::PropertyDescriptor::Data(value, attrs));
 }
 
+void FinishOffThreadStencil(
+  JSContext* cx,
+  JS::OffThreadToken* token,
+  JS::InstantiationStorage* storage,
+  already_AddRefed<JS::Stencil>* stencil
+) {
+  already_AddRefed<JS::Stencil> retval = JS::FinishOffThreadStencil(cx, token, storage);
+  *stencil = std::move(retval);
+}
+
 }  // extern "C"
diff --git a/rust-mozjs/src/rust.rs b/rust-mozjs/src/rust.rs
index 2cf4f03a7cf..302201ac2dd 100644
--- a/rust-mozjs/src/rust.rs
+++ b/rust-mozjs/src/rust.rs
@@ -976,7 +976,11 @@ pub unsafe fn FinishOffThreadStencil(
     token: *mut OffThreadToken,
     storage: *mut InstantiationStorage,
 ) -> Stencil {
-    let stencil = jsapi::FinishOffThreadStencil(cx, token, storage);
+    let mut stencil = already_AddRefed {
+        mRawPtr: std::ptr::null_mut(),
+        _phantom_0: PhantomData,
+    };
+    crate::glue::FinishOffThreadStencil(cx, token, storage, &mut stencil);
     return Stencil { inner: stencil };
 }
 
diff --git a/rust-mozjs/tests/offthread.rs b/rust-mozjs/tests/offthread.rs
new file mode 100644
index 00000000000..1c06b0c2b34
--- /dev/null
+++ b/rust-mozjs/tests/offthread.rs
@@ -0,0 +1,101 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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/. */
+
+#[macro_use]
+extern crate mozjs;
+
+use std::os::raw::c_void;
+use std::ptr;
+use std::sync::mpsc::{channel, Sender};
+
+use mozjs::jsapi::{
+    JS_NewGlobalObject, OnNewGlobalHookOption, OffThreadToken, CanCompileOffThread,
+    CompileToStencilOffThread1, InstantiateOptions, InstantiateGlobalStencil, JSAutoRealm,
+};
+use mozjs::jsval::UndefinedValue;
+use mozjs::rust::{
+    JSEngine, RealmOptions, Runtime, SIMPLE_GLOBAL_CLASS, CompileOptionsWrapper,
+    transform_str_to_source_text, FinishOffThreadStencil, wrappers::JS_ExecuteScript
+};
+
+struct Token(*mut OffThreadToken);
+
+unsafe impl Send for Token {}
+
+struct Context {
+    text: String,
+    sender: Sender<Token>,
+}
+
+unsafe extern "C" fn callback(
+    token: *mut OffThreadToken,
+    callback_data: *mut c_void,
+) {
+    let context = Box::from_raw(callback_data as *mut Context);
+    let token = Token(token);
+    context.sender.send(token).unwrap();
+}
+
+#[test]
+fn evaluate() {
+    let engine = JSEngine::init().unwrap();
+    let runtime = Runtime::new(engine.handle());
+    let context = runtime.cx();
+    let h_option = OnNewGlobalHookOption::FireOnNewGlobalHook;
+    let c_option = RealmOptions::default();
+
+    unsafe {
+        rooted!(in(context) let global = JS_NewGlobalObject(
+            context,
+            &SIMPLE_GLOBAL_CLASS,
+            ptr::null_mut(),
+            h_option,
+            &*c_option,
+        ));
+
+        let _ac = JSAutoRealm::new(context, global.get());
+
+        let src = "1 + 1".to_string();
+        let mut options = CompileOptionsWrapper::new(context, "", 1);
+        (*options.ptr)._base.forceAsync = true;
+        let options_ptr = options.ptr as *const _;
+        assert!(CanCompileOffThread(context, options_ptr, src.len()));
+        let (sender, receiver) = channel();
+        let script_context = Box::new(Context {
+            text: src,
+            sender,
+        });
+        assert!(!CompileToStencilOffThread1(
+            context,
+            options_ptr,
+            &mut transform_str_to_source_text(&script_context.text) as *mut _,
+            Some(callback),
+            Box::into_raw(script_context) as *mut c_void,
+        ).is_null());
+
+        let token = receiver.recv().unwrap();
+        let compiled_script = FinishOffThreadStencil(context, token.0, ptr::null_mut());
+        assert!(!compiled_script.is_null());
+
+        let options = InstantiateOptions {
+            skipFilenameValidation: false,
+            hideScriptFromDebugger: false,
+            deferDebugMetadata: false,
+        };
+        rooted!(in(context) let script = InstantiateGlobalStencil(
+            context,
+            &options,
+            *compiled_script,
+            ptr::null_mut(),
+        ));
+
+        rooted!(in(context) let mut rval = UndefinedValue());
+        let result = JS_ExecuteScript(context, script.handle(), rval.handle_mut());
+        assert!(result);
+        /*assert!(runtime
+           .evaluate_script(global.handle(), "1 + 1", "test", 1, rval.handle_mut())
+            .is_ok());*/
+        assert_eq!(rval.get().to_int32(), 2);
+    }
+}