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Bug 1291709 - PdfjsChromeUtils.jsm leaks browser.xul windows.
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@ -53,7 +53,7 @@ var PdfjsChromeUtils = {
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*/
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init: function () {
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this._browsers = new Set();
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this._browsers = new WeakSet();
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if (!this._ppmm) {
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// global parent process message manager (PPMM)
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this._ppmm = Cc['@mozilla.org/parentprocessmessagemanager;1'].
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