You click a button and it saves a list of your open tabs. You can sort and organize your tab list(s) and even prevent it from storing dupes.
It is basically a glorified bookmarking solution.
Just try it for a few days. When things get out of hand, click the button. Boom, no more tabs. You will be surprised how often you go back to read those tabs you needed (for me, almost never). You can go and search when you remember a month later about that one site about that thing (via ctrl-f broswer search on the onetab tab).
Some have complained that no "tab history" is stored, but for me, I don't need any of that. I just need to know that my tabs are saved so I can feel safe closing them. I have a problem...
OneTab gives me one button to click that gives me peace of mind, and more memory. I even use it for most of my bookmarking needs, since it is so flexible.
There are plenty of extension options for dealing with tabs, and consolidating them to a meta-list like that is a lot better than having them open as running processes the whole time if you're not using them.
Go through your tabs one-by-one and spend a moment with it. Look at it. Try to remember why you got there in the first place. What rabbit hole were you exploring? Why are you reluctant to set this tool down?
What is your brain associating this tab to? Consider making a bookmark folder for that topic. Append your own personal keywords to the page title. Chrome has a search for bookmarks, use it.
I find this process to be insanely beneficial. I'm generally reluctant to let anything go and need to spends few conscious moments 'saying goodbye' to things like these to free me from worry. I now practice zero-tolerance new browser session at work each morning. At home I have one Chrome instance with ~5 tabs on average.
I'm part of a team looking to build a browser extension that provides you with much of this contextual history. A mindfulness tool in a way, which records the steps taken as you traverse a rabbit hole.
Are you pretty diligent with returning to your bookmarks when you're looking for things—rather than conducting fresh Google searches?