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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/0973526f4688d87b1e9779a7eb3ed5a52fdcfe92/inspector.js/clean/extensions/inspector/resources/content/inspector.js