[SuchAnonMuchWow]

Just in case you're open to something new: Tree Style Tabs is my goto extension to managing tabs on firefox

You manage your tabs vertically in a sidebar, organized as a tree. Every new tab is opened as a leaf from the tab that you came from, grouping your tabs by branches following your navigation on the web. This make managing groups of tabs by topics really natural.

[fbcpck]

Addressing grandparent's comment regarding lack of tab grouping, I'd like to share a custom stylesheet for TST that somewhat tries to tackle this:

https://github.com/piroor/treestyletab/discussions/3369

[pasc1878]

Tree style tabs is not new. It predates containers and might even predate chrome