rem: get isViewingContent() { return this.mPanelSet.getPanel(0).subject != null; }, 
add: get panelset() { return this.mPanelSet; }, 
context:   get isViewingContent() { return this.mPanelSet.getPanel(0).subject != null; },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/af197d575f9748de72ac02971d7faad133e22065/inspector.js/buggy/extensions/inspector/resources/content/inspector.js