When I started using firefox for the first time (whoa, tabs!), I started opening dozens of tabs at the same time, thinking I would read them all, one after another. But I could not, and their contents were interesting enough to prevent me from closing them. This habit followed for a long time, I installed a session saver, then I started using a feed reader. I had dozens of subscriptions and, if I didn't check my feeds for a whole day, soon there would be a hundred of them in my inbox — and I had to check them, or else I could lose information.

The stress came from the fear of losing information. It didn't matter if it were tabs, saved sessions or feeds, the idea of not reading any of those interesting articles was something hard to accept. I had to learn how to let this river of information flow without wanting to consume everything. No more feeds, no more than 9 tabs opened, no more saving sessions. This works for me now (most of the time).