Firefox and Firefox Dev - how to make only former use nextdns?

Mac / Sequoia if relevant
Firefox is my daily and I want to block a ton of stuff (I already use various extensions)

Firefox Dev is where I use Container tabs for specific sites and so I block very little.

I cannot seem to get FF to use nextdns and FFDev to NOT use nextdns

Is there a solution or do I need to use another browser? Thanks