For tabs, I can imagine different ways of thinking about them:
1. An activity you have to complete. Or start. 2. A piece of information you think you may need to be aware of. 3. Something that interests you, but you are leaving for when you are in some particular state of mind (e.g., ready to read something long and involved). 4. Something shared with you, that you feel obliged to respond to. 5. One of a set of things that represents some pending task. 6. Something information you may need to revisit. Or you may have finished it, but it's yet to be "garbage collected". MDN pages usually fall in this category for me – I'll quickly come back a couple times to the page, but I only know I'm "finished" because I don't come back. So it sits there.
And for each of these there's the state of "maybe". Maybe I'll need this. Maybe I'll need to be aware of this. Maybe I should reply to my friend about this.
In this case the tabs act as both a reference, and a "task" waiting to be finished. If I finish the task I can close the tabs. Gives me the incentive to finish what I'm working on.
Also thank you for Python's Virtualenv, paste, and webtest. I know your not much into the Python scene anymore but your contributes still effect my day-to-day activities.
It's not paradoxical at all - bookmarks are long-term persistent storage, tabs are short-term volatile storage. Data stored on disk isn't less important than data stored in RAM, but any given datum stored in RAM is a lot more likely to be accessed in the near future.
Doesn't mean I really will look at any of them any time soon though, it's not exactly a _succesful_ information organization method in either case. Which means, yeah, it might be ripe for some clever UX. It's not at all clear what this should be.
Maybe they're not more important but they're more urgent? Since they're ephemeral whereas your bookmarks are still going to be there when you reboot.
It feels like that's the state I'm in with regard to most tabs. It also feels like these tabs are more important than those I've already bookmarked, which seems paradoxical.