How many separate copies of Firefox can you run continuously without causing problems in the browsers' functionality? It's like cloning applications.
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Firefox, Chrome, and other browsers all have numerous processes running while the a single window of the browser is running. There's a process for the interface itself, processes for each tab or group of tabs, and some other stuff. This is normal in modern browsers.
If you're referring to copies - running multiple copies of Firefox Portable with AllowMultipleInstances set - you can run multiple as long as you have enough processing power and RAM.
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