use new API of Multiple Tab Handler
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@ -2313,9 +2313,10 @@ TreeStyleTabBrowser.prototype = {
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onTabsRemoving : function TSTBrowser_onTabsRemoving(aEvent)
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{
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var b = this.getTabBrowserFromChild(aEvent.tabs[0]);
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var tabs = aEvent.tabs || aEvent.getData('tabs');
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var b = this.getTabBrowserFromChild(tabs[0]);
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var trees = this.splitTabsToSubtrees(aEvent.tabs);
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var trees = this.splitTabsToSubtrees(tabs);
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if (trees.some(function(aTabs) {
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return aTabs.length > 1 &&
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!this.fireTabSubtreeClosingEvent(aTabs[0], aTabs);
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