This could be an interesting browser plugin, but I have a hard time seeing a business model. FWIW, I wouldn't use it, simply because I tend to remember looking

This could be an interesting browser plugin, but I have a hard time seeing a business model. FWIW, I wouldn't use it, simply because I tend to remember looking the word up, and if I can't remember what it means, I get frustrated and look it up again. That said, I might be inclined to replace my lookup plugin if it works like this: Use the same functionality as any other define plugin (ie, right click -> define word), but with the extra feature that the next N times you see that word in your browser, the plugin highlights the word and then displays the definition if and only if you mouse over it. Naturally, you'd add two items to the right-click menu. 1) define, 2) see recent definitions. Not sure how much this helps, but good luck.