Browser isolation is smart, and Firefox+Librewolf is better than Firefox+somethingelse.
Don't forget about Firefox profiles though. You can have unlimited, 100% isolated browsers with profiles. I use a few dozen Firefox profiles.
For isolation of cookies but not preferences, you can use Multi-Account Containers within a single Firefox profile. I use this for admin-vs-user accounts at AWS, GitHub, etc.
Don't forget about Firefox profiles though. You can have unlimited, 100% isolated browsers with profiles. I use a few dozen Firefox profiles.
For isolation of cookies but not preferences, you can use Multi-Account Containers within a single Firefox profile. I use this for admin-vs-user accounts at AWS, GitHub, etc.