diff --git a/build/event/dom/base-min.js b/build/event/dom/base-min.js
index 3c764be325..688d39d24c 100644
--- a/build/event/dom/base-min.js
+++ b/build/event/dom/base-min.js
@@ -1,7 +1,7 @@
 /*
 Copyright 2013, KISSY UI Library v1.40dev
 MIT Licensed
-build time: Aug 14 23:59
+build time: Aug 20 18:14
 */
 KISSY.add("event/dom/base/utils",function(e,g){var a="ksEventTargetId_"+e.now(),b=e.Env.host.document;return{simpleAdd:b&&b.addEventListener?function(a,b,g,e){a.addEventListener&&a.addEventListener(b,g,!!e)}:function(a,b,g){a.attachEvent&&a.attachEvent("on"+b,g)},simpleRemove:b&&b.removeEventListener?function(a,b,g,e){a.removeEventListener&&a.removeEventListener(b,g,!!e)}:function(a,b,g){a.detachEvent&&a.detachEvent("on"+b,g)},data:function(b,e){return g.data(b,a,e)},removeData:function(b){return g.removeData(b,
 a)}}},{requires:["dom"]});KISSY.add("event/dom/base/special",function(){return{}});
@@ -12,10 +12,10 @@ props:["rotation","scale"]},{reg:/^(mousewheel|DOMMouseScroll)$/,props:[],fix:fu
 fix:function(c,m){var f,d,b=c.target,i=m.button;null==c.pageX&&null!=m.clientX&&(f=b.ownerDocument||s,d=f.documentElement,f=f.body,c.pageX=m.clientX+(d&&d.scrollLeft||f&&f.scrollLeft||0)-(d&&d.clientLeft||f&&f.clientLeft||0),c.pageY=m.clientY+(d&&d.scrollTop||f&&f.scrollTop||0)-(d&&d.clientTop||f&&f.clientTop||0));!c.which&&i!==a&&(c.which=i&1?1:i&2?3:i&4?2:0);!c.relatedTarget&&c.fromElement&&(c.relatedTarget=c.fromElement===b?c.toElement:c.fromElement);return c}}];e.extend(l,g.Object,{constructor:l,
 preventDefault:function(){var a=this.originalEvent;a.preventDefault?a.preventDefault():a.returnValue=p;l.superclass.preventDefault.call(this)},stopPropagation:function(){var a=this.originalEvent;a.stopPropagation?a.stopPropagation():a.cancelBubble=k;l.superclass.stopPropagation.call(this)}});return l},{requires:["event/base"]});
 KISSY.add("event/dom/base/observable",function(e,g,a,b,q,l,s){function k(a){e.mix(this,a);this.reset()}var p=s.Utils;e.extend(k,s.Observable,{setup:function(){var m=this.type,n=a[m]||{},c=this.currentTarget,j=b.data(c).handle;(!n.setup||!1===n.setup.call(c,m))&&b.simpleAdd(c,m,j)},constructor:k,reset:function(){k.superclass.reset.call(this);this.lastCount=this.delegateCount=0},notify:function(a){var b=a.target,c=a.type,j=this.currentTarget,f=this.observers,d=[],h,i,e=this.delegateCount||0,r,t;if(e&&
-b.nodeType)for(;b!=j;){if(!0!==b.disabled||"click"!==c){var o={},l,k,q;r=[];for(i=0;i<e;i++)t=f[i],q=t.filter,k=q+"",l=o[k],void 0===l&&(l=o[k]=g.test(b,q)),l&&r.push(t);r.length&&d.push({currentTarget:b,currentTargetObservers:r})}b=b.parentNode||j}e<f.length&&d.push({currentTarget:j,currentTargetObservers:f.slice(e)});i=0;for(b=d.length;!a.isPropagationStopped()&&i<b;++i){c=d[i];r=c.currentTargetObservers;c=c.currentTarget;a.currentTarget=c;for(c=0;!a.isImmediatePropagationStopped()&&c<r.length;c++)j=
-r[c],j=j.notify(a,this),!1!==h&&(h=j)}return h},fire:function(b,n){var b=b||{},c=""+this.type,j,f,d=a[c]||{};j=!1!==d.bubbles;var h=this.currentTarget;if(!(d.fire&&!1===d.fire.call(h,n))&&(b instanceof l||(f=b,b=new l({currentTarget:h,type:c,target:h}),e.mix(b,f)),!(d.preFire&&!1===d.preFire.call(h,b,n)))){f=h;var i=g.getWindow(f),u=i.document,d=[],r="on"+c,t=0;do d.push(f),f=f.parentNode||f.ownerDocument||f===u&&i;while(!n&&f&&j);f=d[t];do b.currentTarget=f,(j=k.getDomEventObservable(f,c))&&j.notify(b),
-f[r]&&!1===f[r].call(f)&&b.preventDefault(),f=d[++t];while(!n&&f&&!b.isPropagationStopped());if(!n&&!b.isDefaultPrevented()){try{h[c]&&!e.isWindow(h)&&(k.triggeredEvent=c,h[c]())}catch(o){}k.triggeredEvent=""}}},on:function(b){var e=this.observers,c=a[this.type]||{},b=b instanceof q?b:new q(b);-1==this.findObserver(b)&&(b.filter?(e.splice(this.delegateCount,0,b),this.delegateCount++):b.last?(e.push(b),this.lastCount++):e.splice(e.length-this.lastCount,0,b),c.add&&c.add.call(this.currentTarget,b))},
-detach:function(b){var e,c=a[this.type]||{},j="filter"in b,f=b.filter,d=b.context,h=b.fn,i=this.currentTarget,g=this.observers,b=b.groups;if(g.length){b&&(e=p.getGroupsRe(b));var r,t,o,l,k=g.length;if(h||j||e){d=d||i;r=b=0;for(t=[];b<k;++b)o=g[b],l=o.context||i,d!=l||h&&h!=o.fn||j&&(f&&f!=o.filter||!f&&!o.filter)||e&&!o.groups.match(e)?t[r++]=o:(o.filter&&this.delegateCount&&this.delegateCount--,o.last&&this.lastCount&&this.lastCount--,c.remove&&c.remove.call(i,o));this.observers=t}else this.reset();
+b.nodeType&&(!a.button||"click"!==c))for(;b!=j;){if(!0!==b.disabled||"click"!==c){var o={},l,k,q;r=[];for(i=0;i<e;i++)t=f[i],q=t.filter,k=q+"",l=o[k],void 0===l&&(l=o[k]=g.test(b,q)),l&&r.push(t);r.length&&d.push({currentTarget:b,currentTargetObservers:r})}b=b.parentNode||j}e<f.length&&d.push({currentTarget:j,currentTargetObservers:f.slice(e)});i=0;for(b=d.length;!a.isPropagationStopped()&&i<b;++i){c=d[i];r=c.currentTargetObservers;c=c.currentTarget;a.currentTarget=c;for(c=0;!a.isImmediatePropagationStopped()&&
+c<r.length;c++)j=r[c],j=j.notify(a,this),!1!==h&&(h=j)}return h},fire:function(b,n){var b=b||{},c=""+this.type,j,f,d=a[c]||{};j=!1!==d.bubbles;var h=this.currentTarget;if(!(d.fire&&!1===d.fire.call(h,n))&&(b instanceof l||(f=b,b=new l({currentTarget:h,type:c,target:h}),e.mix(b,f)),!(d.preFire&&!1===d.preFire.call(h,b,n)))){f=h;var i=g.getWindow(f),u=i.document,d=[],r="on"+c,t=0;do d.push(f),f=f.parentNode||f.ownerDocument||f===u&&i;while(!n&&f&&j);f=d[t];do b.currentTarget=f,(j=k.getDomEventObservable(f,
+c))&&j.notify(b),f[r]&&!1===f[r].call(f)&&b.preventDefault(),f=d[++t];while(!n&&f&&!b.isPropagationStopped());if(!n&&!b.isDefaultPrevented()){try{h[c]&&!e.isWindow(h)&&(k.triggeredEvent=c,h[c]())}catch(o){}k.triggeredEvent=""}}},on:function(b){var e=this.observers,c=a[this.type]||{},b=b instanceof q?b:new q(b);-1==this.findObserver(b)&&(b.filter?(e.splice(this.delegateCount,0,b),this.delegateCount++):b.last?(e.push(b),this.lastCount++):e.splice(e.length-this.lastCount,0,b),c.add&&c.add.call(this.currentTarget,
+b))},detach:function(b){var e,c=a[this.type]||{},j="filter"in b,f=b.filter,d=b.context,h=b.fn,i=this.currentTarget,g=this.observers,b=b.groups;if(g.length){b&&(e=p.getGroupsRe(b));var r,t,o,l,k=g.length;if(h||j||e){d=d||i;r=b=0;for(t=[];b<k;++b)o=g[b],l=o.context||i,d!=l||h&&h!=o.fn||j&&(f&&f!=o.filter||!f&&!o.filter)||e&&!o.groups.match(e)?t[r++]=o:(o.filter&&this.delegateCount&&this.delegateCount--,o.last&&this.lastCount&&this.lastCount--,c.remove&&c.remove.call(i,o));this.observers=t}else this.reset();
 this.checkMemory()}},checkMemory:function(){var g=this.type,l,c,j=a[g]||{},f=this.currentTarget,d=b.data(f);if(d&&(l=d.observables,this.hasObserver()||(c=d.handle,(!j.tearDown||!1===j.tearDown.call(f,g))&&b.simpleRemove(f,g,c),delete l[g]),e.isEmptyObject(l)))d.handle=null,b.removeData(f)}});k.triggeredEvent="";k.getDomEventObservable=function(a,e){var c=b.data(a),j;c&&(j=c.observables);return j?j[e]:null};k.getDomEventObservablesHolder=function(a,e){var c=b.data(a);!c&&e&&b.data(a,c={});return c};
 return k},{requires:"dom,./special,./utils,./observer,./object,event/base".split(",")});
 KISSY.add("event/dom/base/dom-event",function(e,g,a,b,q,l,s){function k(a,b){var c=q[b]||{},e;if(!a.originalType&&(e=c.typeFix))a.originalType=b,b=e;return b}function p(a,b,c){var h,i,g,c=e.merge(c),b=k(c,b);h=l.getDomEventObservablesHolder(a,1);if(!(g=h.handle))g=h.handle=function(a){var b=a.type,c=g.currentTarget;if(!(l.triggeredEvent==b||"undefined"==typeof KISSY))if(b=l.getDomEventObservable(c,b))return a.currentTarget=c,a=new s(a),b.notify(a)},g.currentTarget=a;if(!(i=h.observables))i=h.observables=
diff --git a/build/event/dom/base.js b/build/event/dom/base.js
index f8f6d76915..69301766f5 100644
--- a/build/event/dom/base.js
+++ b/build/event/dom/base.js
@@ -1,7 +1,7 @@
 /*
 Copyright 2013, KISSY UI Library v1.40dev
 MIT Licensed
-build time: Aug 14 23:59
+build time: Aug 20 18:14
 */
 /*
  Combined processedModules by KISSY Module Compiler: 
@@ -647,8 +647,7 @@ KISSY.add('event/dom/base/object', function (S, BaseEvent, undefined) {
  * custom event for dom.
  * @author yiminghe@gmail.com
  */
-KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils,
-                                                 DomEventObserver, DomEventObject, BaseEvent) {
+KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils, DomEventObserver, DomEventObject, BaseEvent) {
 
     // 记录手工 fire(domElement,type) 时的 type
     // 再在浏览器通知的系统 eventHandler 中检查
@@ -731,7 +730,9 @@ KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils,
                 observer;
 
             // collect delegated observers and corresponding element
-            if (delegateCount && target.nodeType) {
+            // https://github.com/kissyteam/kissy/issues/437
+            if (delegateCount && target.nodeType &&
+                (!event['button'] || eventType !== "click")) {
                 while (target != currentTarget) {
                     if (target.disabled !== true || eventType !== "click") {
                         var cachedMatch = {},
diff --git a/src/event/sub-modules/dom/sub-modules/base/src/base/observable.js b/src/event/sub-modules/dom/sub-modules/base/src/base/observable.js
index d75b4e46ff..e2ef6e9ae8 100644
--- a/src/event/sub-modules/dom/sub-modules/base/src/base/observable.js
+++ b/src/event/sub-modules/dom/sub-modules/base/src/base/observable.js
@@ -3,8 +3,7 @@
  * custom event for dom.
  * @author yiminghe@gmail.com
  */
-KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils,
-                                                 DomEventObserver, DomEventObject, BaseEvent) {
+KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils, DomEventObserver, DomEventObject, BaseEvent) {
 
     // 记录手工 fire(domElement,type) 时的 type
     // 再在浏览器通知的系统 eventHandler 中检查
@@ -87,7 +86,9 @@ KISSY.add('event/dom/base/observable', function (S, Dom, Special, DomEventUtils,
                 observer;
 
             // collect delegated observers and corresponding element
-            if (delegateCount && target.nodeType) {
+            // https://github.com/kissyteam/kissy/issues/437
+            if (delegateCount && target.nodeType &&
+                (!event['button'] || eventType !== "click")) {
                 while (target != currentTarget) {
                     if (target.disabled !== true || eventType !== "click") {
                         var cachedMatch = {},
diff --git a/src/event/sub-modules/dom/sub-modules/base/tests/manual/delegate/click-firefox.html b/src/event/sub-modules/dom/sub-modules/base/tests/manual/delegate/click-firefox.html
new file mode 100644
index 0000000000..ccfa8e3225
--- /dev/null
+++ b/src/event/sub-modules/dom/sub-modules/base/tests/manual/delegate/click-firefox.html
@@ -0,0 +1,16 @@
+<div style="width: 100px;height: 100px;border: 1px solid red;" id="t">
+    <div
+            id="t2"
+            style="width: 40px;height:40px;margin: 20px;border: 1px solid green;"></div>
+</div>
+<script src="/kissy/build/seed.js"></script>
+<script>
+    KISSY.use('node', function (S, Node) {
+        S.ready(function () {
+            var $ = Node.all;
+            $('#t').on('click', function (e) {
+                alert(e.target.id + ' : ' + e.button);
+            });
+        });
+    });
+</script>
\ No newline at end of file