Compartmentalisation of browser account

Well,I remember seeing some random video in yt long back.
Is was an application for Linux that help you compartmentalize our online accounts very easily.Online accounts like git,twr,stack,fdroid-forum …etc. Yet is does not have an link with each other. Just like having different browser for every thing .and I could use different browser but I only really trust Firefox and chromium for they security.

Even with different browser this is much better I hope
So can anyone help find that application or alternative to that.

https://search.f-droid.org/?q=sandbox&lang=en -> Webapps ?

Firefox Multi-Account Containers maybe?

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First Party Isolation is way more seamless then containers.
FPI is enabled by default in Mull.