The Camelizer adds price history charts and price watch features to product pages on sites like Amazon, Best Buy, and Newegg. Use it to make informed purchasing decisions and to receive price drop alerts via email, Twitter, or RSS feed.
Here is a little more information about the add-on from the developer:
The main feature of the Camelizer is to provide price history charts beneath Amazon and other retailer product pages. This lets you decide if the current price is good or not, based on historical data. This add-on uses camelcamelcamel.com, camelbuy.com, and camelegg.com to provide some neat features at popular retail websites like Amazon.com, BestBuy.com, and Newegg.com.
Interested in learning more about The Camelizer? You can pick up this add-on from the Firefox Add-on website.