How to use multiple facebook accounts at the same time?

Question

Facebook

Good afternoon!
Perhaps someone has come across this. There are at least 5 working Facebook accounts. How can you have conversations in them at the same time without switching between accounts? It is primarily about the phone.
I didn’t find anything smarter than installing messenger and lite messenger on the Internet among the tips :( And then these are only 2 accounts.

Answer 1

5 browsers, or less in incognito mode,
or 5 phones
or APIs, but APIs are not for this

Answer 2

https://support.mozilla.org/en-US/kb/containers
https://addons.mozilla.org/uk/firefox/addon/multi-...

Answer 3

It is logical to conduct from a computer in some kind of software in Jarvi