"Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile."

Howdy, Workflow: I have a firefox instance already running. I want to launch a new firefox in safe-mode to test something without disrupting my existing firefox. Problem: I try to launch a new firefox in safe mode using `firefox --safe-mode`, but firefox just opens a new window NOT in safe mode. I think it may because firefox in safe-mode requires launching launching from a new instance rather than attaching to existing instance. `firefox --help` shows a flag I can use: --new-instance Open new instance, not a new window in running instance. --safe-mode Disables extensions and themes for this session. So I run `firefox --safe-mode --new-instance` now I get error popup with message: "Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile." Now I think what is the point of the flag "new-instance" if Firefox doesn't support multiple instances? Regardless, how can I launch firefox in safe-mode without disrupting my existing firefox instance and without relying on creating a profile just for this?