I think what they're getting at is not letting themselves make the "I'll get back to it later" choice. Either it's important enough to read and take action on now, or it's not important enough. There really aren't many things that are important to do later - and leaving open browser tabs is a pretty bad way to get those things done later.
I take that to mean that if you found something on the net but it requires in-depth study or concentration than don't leave the tab open but instead put it on your TODO list (whatever mechanism) and not add another mechanism in the form of random tabs. Just closing and thus forgetting a page discards knowledge (because in all likelihood you will not find the pager later again) and I doubt that discarding knowledge is a good idea.
This is the public group instrumental rationality diary for November 16-30 (that I've now fished out of my drafts folder, *cough*.)
The poll earlier this month seems to be sufficiently in favor of maintaining the current schedule that extra votes are unlikely to change things much, but if you'd really like to register your opinion, you are welcome to do so here.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: November 1-15
Rationality diaries archive