nostr:npub1kpwlxpzkxfmuxjmzc2wp3rf9vjg0sgydmlhsnrgqr3maf59h86qqdxxzz4 

I advise googling for : Tab collections in Firefox for Linux

One of the suggestions is an add-on, which might do what you want in Linux.

https://www.techrepublic.com/article/firefox-finally-tab-management-add-on-worth-using/

Good luck at finding a solution.