This great add-on for Firefox will convert units, timezones and currencies on any web page — and you also get a shopping assistant finding the best prices for you! (Currency conversions and the shopping assistant are disabled by default, but you can enable and disable them at any time.)
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Get the Lowest Price with InvisibleHand

Searching for a better deal while you shop Online? The InvisibleHand add-on for Firefox might be the next browsing companion you need to pick up. Once installed, this add-on for Firefox will let you know if the product you are looking for is cheaper somewhere else.
10 Great Money Saving Add-ons for Firefox
We can’t count on Uncle Sam to get us out of our economic woes, so who can we trust? I say trust Firefox. It has never asked for a penny, and is always so reliable. With that said, what Firefox add-ons out there will help you save some money? Here are my favorites:
RetailMeNot – Never miss a bargain again. Automatically informs you of sites that retailmenot.com users have shared discount coupon codes for.
Woot Watcher – Woot Watcher monitors the Woot! web site, and keeps you updated with the current item, price, and if it is sold out.
Price Protectr Toolbar – Price protect your purchases with a single click! Watch and target prices, find coupons, get retailer ratings, and improve your online shopping experience.
PriceDrop – An extension which helps you track Amazon product prices and get notifications when they drop.
PriceAdvance – Get price comparisons as you shop around the Web, so you can get the best deal.
Forex Currency Converter – Just click on any currency data on any web page to convert that amount across over 180 foreign exchange rates right on your screen.
KeepCash Coupon Notifier – Lightweight Firefox extension to notify you when online coupons exist for a site that you are shopping at.
Pronto Shopping Messenger – Instant price comparisons when you shop online via a small message window that alerts you of potential savings.
BuyBuddy – Locate products on those pages that are offered through Amazon and ‘tag’ them.
MoneyQuake – Moneyquake is a extension, which displays your real-time earning statistics from most popular advertisement systems (such as Google AdSense).
Know of another add-on that helps you keep a ‘bit more of the green stuff in your wallet? If so, drop it into the comments. We will just consider this an economic stimulus for us Firefox fans.
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