Run multiple instances of the same application (Firefox, Opera, etc.) on Mac OS X?

I know that I can do this through profiles in Firefox, but is there an easy way to quickly and automatically configure this for multiple applications or a more general way for general applications? I could have sworn there was a shareware utility that did this, but after half an hour of Google searches, I couldn't find anything.

I need to be able to run multiple copies of the same application, not multiple windows, in order to test websites while doing other work (and so that my personal browsing is separate).

I am running Lion.

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You can run multiple instances of the application using the terminal, but you need to run the application binary located in the Contents/MacOS/ folder

Launch a terminal and enter the following command:

 /Applications/Safari.app/Contents/MacOS/Safari & 

It will launch a new instance of Safari.

But for Firefox, this trick will not work, because Firefox will complain that it can work only one instance at a time. Other applications, such as iTunes, themselves will control this to limit you to only one instance running at a time.

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I bet the conditional utility you had in mind is SwitchUp, formerly called rooSwitch .

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Source: https://habr.com/ru/post/1396430/


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