Actually, it's a search engine browser extension called SearchRadar.
http://searchradar.webaroo.com/
Quote:
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Get Search Radar suggestions on all your Google and Yahoo searches automatically with the Search Radar Browser Extension. When you search using Google or Yahoo, this extension will display a list of relevant suggestions on the right panel to help you refine your search query.
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However, it strikes me you could use this to research keyword lists.