|First, Firefox is acting the same way on windows and linux.|
Even on linux, you can run Firefox -p and will get the Firefox Profile Manager.
On Windows, you click on Start / Run, search, navigate to P:\Program Files\Mozilla Firefox and doubleclick firefox.exe.
Back to the run line, hit space key one time and type -p then click ok. Now you will get the Firefox Profile Manger.
Same thing in Linux. You can run Firefox from terminal console like
If you simply want to copy the contents of the old profile folder of firefox, and I mean only the contents of the FIREFOX PROFILE FOLDER, yes, you have to replace the files.
But simply give it a try on your linux machine, to figure out, what you get on firefox -p
It doesn't harm.
You will get a window, where you get a list of the already existing profiles.
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