Since the popularization of browsers with tabs in 1999, that has been a problem for intelectual people, I think.
I’m trying to live a digital minimalism (whatever that means, I’ve had long conversations about the definition), and having at most 5 tabs open has been challenging to me, but I try.
I’m looking forward to a soft limit of, let’s say, 7-10 tabs. If you get your screen full, you should receive a warning… More than 15-25 would be simply not allowed. It’s against the interest of browsers designers (use it more), but I think there should be some extension for it.
Now I have those endless text files with hundreds of links, more like a black hole than a Reading list. I say also, the habit of cleaning your lists is as good as making it bigger.
Other useful habits are, trying to write more than reading, avoid looking for new links until you read or delete previous ones, and not subscribing to a new mailing list until I unsuscribe another. It has been a similar pain than to buy new clothes.