How do you find out what Firefox Profile is running when Firefox is running? - Super Userhttps://superuser.com/questions/460223/how-do-you-find-out-what-firefox-profile-is-running-when-firefox-is-running
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Enter "about:support" as URL and select the "Open containing folder" button. You can reach it using Menu "Help" -> "Troubleshooting Information", too:
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MacOS default path:
${HOME}/Library/Application Support/Firefox/