A reader (who didn't leave his name, though from the email address it should be a Marc or Marc-Andre) wrote me an email to tell me about this Firefox extension, GooglePreview that inserts previews of search results pages before each search result at Google. Quite neat.

Screenshot of GooglePreview extension in action

It also inserts product screenshots from Amazon if a search result points to Amazon and even a stock's trends (see the GooglePreview website for screenshots).

Thanks for the heads up Marc!

Rory asked how it works, so I took a quick look at the source of the XPI and found out how.