How to start Firefox multiple isolated sessions with same profile?

I use proxychains utility with firefox. I want to start the firefox profile twice, but with other proxychains parameters. But I can't, when I try to run the second instance of firefox with the same profile, it's just opens a new window of exiting session. I have tried this commands: firefox -P profile %u, firefox -P profile --new-instance, firefox -P profile --no-remote, firefox -P profile --new-window. Nothing worked. Hope for your help!