Firefinder - Quick access to what you want to see.

Robert Niemann has created a new FireBug plugin called FireFinder .

The idea is to interactively query CSS or XPath style selectors in the current document to see what will match these selectors, or how many instances correspond to this selector (for studying certain text headings, for example).
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This plugin offers:

• A quick way to filter HTML elements through CSS / XPath selector (s);
• Highlighting selected elements in the document;
• Listing them in the FireBug panel in the collapsible list;
• Count the total number of selected items.