don't save children information if it is not needed
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@ -2149,7 +2149,8 @@ TreeStyleTabBrowser.prototype = {
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this.stopRendering();
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var backupAttributes = {};
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backupAttributes[this.kCHILDREN] = this.getTabValue(tab, this.kCHILDREN);
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if (this.hasChildTabs(tab))
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backupAttributes[this.kCHILDREN] = this.getTabValue(tab, this.kCHILDREN);
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var subtreeCollapsed = this.isSubtreeCollapsed(tab);
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if (
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