diff --git a/src/core/util/env.js b/src/core/util/env.js
index eff1d21dc75..7c508f29802 100644
--- a/src/core/util/env.js
+++ b/src/core/util/env.js
@@ -16,6 +16,7 @@ export const isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform ==
 export const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge
 export const isPhantomJS = UA && /phantomjs/.test(UA)
 export const isFF = UA && UA.match(/firefox\/(\d+)/)
+export const isPaleMoon = UA && UA.match(/palemoon\/(\d+)/)
 
 // Firefox has a "watch" function on Object.prototype...
 export const nativeWatch = ({}).watch
diff --git a/src/platforms/web/runtime/modules/events.js b/src/platforms/web/runtime/modules/events.js
index ecb08af32de..527387bd932 100644
--- a/src/platforms/web/runtime/modules/events.js
+++ b/src/platforms/web/runtime/modules/events.js
@@ -2,7 +2,7 @@
 
 import { isDef, isUndef } from 'shared/util'
 import { updateListeners } from 'core/vdom/helpers/index'
-import { isIE, isFF, supportsPassive, isUsingMicroTask } from 'core/util/index'
+import { isIE, isFF, isPaleMoon, supportsPassive, isUsingMicroTask } from 'core/util/index'
 import { RANGE_TOKEN, CHECKBOX_RADIO_TOKEN } from 'web/compiler/directives/model'
 import { currentFlushTimestamp } from 'core/observer/scheduler'
 
@@ -42,7 +42,7 @@ function createOnceHandler (event, handler, capture) {
 // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
 // implementation and does not fire microtasks in between event propagation, so
 // safe to exclude.
-const useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53)
+const useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53) && !isPaleMoon
 
 function add (
   name: string,