diff --git a/dist/zone-microtask.js b/dist/zone-microtask.js
index b093b75ec..09d03d271 100644
--- a/dist/zone-microtask.js
+++ b/dist/zone-microtask.js
@@ -1135,12 +1135,13 @@ module.exports = {
 // TODO(vicb): Create a benchmark for the different methods & the usage of the queue
 // see https://github.com/angular/zone.js/issues/97
 
-var hasNativePromise = false;
 var len = 0;
 
-if (typeof Promise ==! "undefined" && Promise.toString().indexOf("[native code]") !== -1) {
-  hasNativePromise = true;
-}
+var hasNativePromise = typeof Promise ==! "undefined" &&
+                       Promise.toString().indexOf("[native code]") !== -1;
+
+var isFirefox = global.navigator &&
+                global.navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
 
 function asap(callback) {
   queue[len] = callback;
@@ -1206,7 +1207,9 @@ function flush() {
 
 var scheduleFlush;
 // Decide what async method to use to triggering processing of queued callbacks:
-if (hasNativePromise) {
+if (hasNativePromise && !isFirefox) {
+  // TODO(vicb): remove '!isFirefox' when the bug is fixed:
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1162013
   scheduleFlush = usePromise();
 } else if (BrowserMutationObserver) {
   scheduleFlush = useMutationObserver();
diff --git a/dist/zone-microtask.min.js b/dist/zone-microtask.min.js
index 0328e4043..cdd54bc9d 100644
--- a/dist/zone-microtask.min.js
+++ b/dist/zone-microtask.min.js
@@ -1 +1 @@
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e.zone.dequeueTask(n),i}}function s(t){var r=e[t];if(r){e[t]=function(){var e=n(arguments);switch(e.length){case 0:this._o=new r;break;case 1:this._o=new r(e[0]);break;case 2:this._o=new r(e[0],e[1]);break;case 3:this._o=new r(e[0],e[1],e[2]);break;case 4:this._o=new r(e[0],e[1],e[2],e[3]);break;default:throw new Error("what are you even doing?")}};var o,i=new r("MutationObserver"===t.substr(-16)?function(){}:void 0);for(o in i)!function(n){"function"==typeof i[n]?e[t].prototype[n]=function(){return this._o[n].apply(this._o,arguments)}:Object.defineProperty(e[t].prototype,n,{set:function(t){this._o[n]="function"==typeof t?e.zone.bind(t):t},get:function(){return this._o[n]}})}(o)}}t.exports={bindArguments:n,bindArgumentsOnce:r,patchPrototype:o,patchProperty:i,patchProperties:u,patchEventTargetMethods:a,patchClass:s}}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{}]},{},[1]);
\ No newline at end of file
diff --git a/lib/microtask.js b/lib/microtask.js
index e14b49c87..89d331cf2 100644
--- a/lib/microtask.js
+++ b/lib/microtask.js
@@ -21,12 +21,13 @@ module.exports = {
 // TODO(vicb): Create a benchmark for the different methods & the usage of the queue
 // see https://github.com/angular/zone.js/issues/97
 
-var hasNativePromise = false;
 var len = 0;
 
-if (typeof Promise ==! "undefined" && Promise.toString().indexOf("[native code]") !== -1) {
-  hasNativePromise = true;
-}
+var hasNativePromise = typeof Promise ==! "undefined" &&
+                       Promise.toString().indexOf("[native code]") !== -1;
+
+var isFirefox = global.navigator &&
+                global.navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
 
 function asap(callback) {
   queue[len] = callback;
@@ -92,7 +93,9 @@ function flush() {
 
 var scheduleFlush;
 // Decide what async method to use to triggering processing of queued callbacks:
-if (hasNativePromise) {
+if (hasNativePromise && !isFirefox) {
+  // TODO(vicb): remove '!isFirefox' when the bug is fixed:
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1162013
   scheduleFlush = usePromise();
 } else if (BrowserMutationObserver) {
   scheduleFlush = useMutationObserver();
diff --git a/test/microtasks.spec.js b/test/microtasks.spec.js
index 805b5d12b..ad6b445d2 100644
--- a/test/microtasks.spec.js
+++ b/test/microtasks.spec.js
@@ -21,7 +21,7 @@ describe('Microtasks', function () {
   });
 
   // Does not currently work with Firefox, see https://bugzilla.mozilla.org/show_bug.cgi?id=1162013
-  xit('should correctly schedule microtasks vs macrotasks', function(done) {
+  it('should correctly schedule microtasks vs macrotasks', function(done) {
     var log = ['+root'];
 
     zone.scheduleMicrotask(function() {