Pronto Shopping Messenger
Pronto Shopping Messenger is a new Firefox experience for a best shopping online thanks to Pronto service. The extension brings you instant price comparisons from over 50,000 top Web merchants (U.S. only). Whenever you shop for a product online, Pronto searches for a lower price and alerts you to potential savings with a small message window in your Firefox browser.
The Pronto Shopping Messenger lets you instantly compare prices as you shop online, and automatically save with exclusive coupons delivered while you shop. Note that Pronto currently only works for retailers selling in US dollars
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