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run two or more instances of firefox at same time

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Hello. How can i run multiple instances of firefox at the same time? I read this article https://support.mozilla.org/bm/questions/1155401 but it looks outdated because this doesnt work for. I tried PS D:\Program Files\PortableApps\PortableApps\FirefoxPortableESR> .\FirefoxPortable.exe -ProfileManager PS D:\Program Files\PortableApps\PortableApps\FirefoxPortableESR> .\FirefoxPortable.exe -no-remote PS D:\Program Files\PortableApps\PortableApps\FirefoxPortableESR> .\FirefoxPortable.exe -no-remote -ProfileManager I use firefox 78 as main instance and i wanna use esr as other instances. Thanks.

Chosen solution

Firefox Portable is a 3rd party build that has its own way of launching multiple instances, far different that the official Firefox builds do.

Support for Portable is over here:
https://portableapps.com/forums/support/firefox_portable

That said, Firefox doesn't need to have multiple different Firefox program installations to be able to launch multiple, simultaneous Profiles. That's been a standard feature in Firefox for a number of years now.
https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

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Chosen Solution

Firefox Portable is a 3rd party build that has its own way of launching multiple instances, far different that the official Firefox builds do.

Support for Portable is over here:
https://portableapps.com/forums/support/firefox_portable

That said, Firefox doesn't need to have multiple different Firefox program installations to be able to launch multiple, simultaneous Profiles. That's been a standard feature in Firefox for a number of years now.
https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

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