chrome://browser/content/browser.xul

Click "Inspect" (Icon with a mouse showing a keypress)

In the preview of what the .xul looks like (navigation-toolbar, tabs, bookmarks-toolbar) you select / press on the element you wish to inspect further ..

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A new video tutorial app - SCOtutor for ScreenFlow - has just been released and is now available in both the Mac and iTunes Apps Stores. ScreenFlow is the ultimate video capture and editing package for creating screencasts. SCOtutor for ScreenFlow takes you through the basics of mastering ScreenFlow in a simple, easy to follow, logical structure. The video tutorial has been created by Don McAllister, one of the leading professional screencasters and is available on both the Mac and iOS.