I use the simple tab groups plugin and I normally have quite a few tabs open (but only a few visible at a time).
I group my tabs by project/topic so I can just send them to the background when I'm not working on that project and bring them back up when I context switch back to that project. So I'll have like 20 different groups, each dedicated to a specific personal project, some upstream project I'm contributing to, to an academic topic I'm studying (ex: PL theory, abstract algebra, topology, cryptography, etc), a group dedicated to looking into job opportunities, and then also some entertainment groups that have the youtube playlists I'm currently working through (some just fun, some niche topics, some tech) as well as other "third monitor content".
Each group acts less like bookmarks and more like a workspace you can quickly send to the background, pull back up to the foreground, or rotate between windows/monitors (without also moving pinned tabs which stay fixed to the window they are in).
It makes multitasking easier and you don't really get much memory overhead since the tabs generally all suspend automatically after a certain amount of inactivity anyways (might be due to the tab group plugin or another autosuspend plugin I have).
To give a TLDR: I use it to context switch quickly between projects without having to manually reopen stuff in the order it was in and at the spots on the pages where I was when I left off. So when I tab over on tmux to the workspace for a project that I haven't touched in a while, I can pull up the firefox tab group on my documentation window/monitor and immediately see where I left off and I can pick right back up again.
I group my tabs by project/topic so I can just send them to the background when I'm not working on that project and bring them back up when I context switch back to that project. So I'll have like 20 different groups, each dedicated to a specific personal project, some upstream project I'm contributing to, to an academic topic I'm studying (ex: PL theory, abstract algebra, topology, cryptography, etc), a group dedicated to looking into job opportunities, and then also some entertainment groups that have the youtube playlists I'm currently working through (some just fun, some niche topics, some tech) as well as other "third monitor content".
Each group acts less like bookmarks and more like a workspace you can quickly send to the background, pull back up to the foreground, or rotate between windows/monitors (without also moving pinned tabs which stay fixed to the window they are in).
It makes multitasking easier and you don't really get much memory overhead since the tabs generally all suspend automatically after a certain amount of inactivity anyways (might be due to the tab group plugin or another autosuspend plugin I have).
To give a TLDR: I use it to context switch quickly between projects without having to manually reopen stuff in the order it was in and at the spots on the pages where I was when I left off. So when I tab over on tmux to the workspace for a project that I haven't touched in a while, I can pull up the firefox tab group on my documentation window/monitor and immediately see where I left off and I can pick right back up again.