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Firefox user Asian Angel loves Portable Firefox for projects like creating a Google Chrome clone, but you can also use it to run multiple, sandboxed instances of the browser at the same time. What's the point? Well, it lets you log into multiple accounts at the same service (like Gmail) in different windows, and run certain extensions and styles in one browser instance but not another. You already know how to create multiple Firefox profiles and even run them simultaneously, but using Portable Firefox you can easily back up your customized installations and run them anywhere. Reader Asian Angel explains how she assembled a colorful "Firefox six pack" using the portable app.