Most Firefox add-ons enhance the browser's core feature set, provide convenient Web browsing tools, or plug in the proverbial bells and whistles (e-mail notifiers, current weather data or cosmetic makeovers).
But there are others that could be considered applications on their own. Some of these "add-on apps" work well enough to replace a standalone desktop application. Here are seven add-ons that transform Firefox into a fully functioning application.
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