I'm not trying to diss. I get it if you use WebUi of messenger services and maybe stats but can't think what-else it would be. I'd rather open a new browser window for those important services.
Myself gets overwhelmed when I have more than five. I use the bookmark bar more than tabs but an excessive amount of tabs? I would see it as a form of data hoarding...
I close all tabs when I finish work daily. As the same that I move all emails in to a week ending folder ensuring that I have a clean mailbox for the following Monday.