You could have downloaded BetterSearch 1.9 for Mac from our software library for free. BetterSearch for Mac belongs to Internet & Network Tools. The actual developer of this free software for Mac is Carlo Zottmann.
From the developer:
An extension for Firefox which enhances Google (all international flavours, too), MSN Search, Yahoo Search, A9, Answers.com (web results), AllTheWeb, Dogpile.com, del.icio.us and Simpy.com bookmarks by adding previews (thumbnails) and Amazon product images and info (type, price, rating for US/DE/UK/CA/FR products), a quick preview feature as well as "Open in New Window", "Site Info" and "Wayback Machine" links to the search results.
You may want to check out more Mac applications, such as Delete Flash Cookies, Subio or RSS Checker, which might be similar to BetterSearch.