I know how tough to keep your open tabs in order. You keep tabs open if you want to get back to them in a while. You don't want to miss out some important information. At some moment you'll loose control and number of open tabs will growth really fast. Let's test real importance of the things. Let them expire and be removed after some time. If you have not had a time to open them again, let them disappear and they won't be bothering you anymore. Your time and attention is the most valuable thing here!