Please don’t even call out to the server, unless I actively interact with the page. I sometimes open 50 or 60 browser tabs at once, and when I unsleep my laptop or connect to a new wifi hotspot, many of them try to simultaneously make such ajax calls, which prevents any other web pages I want to open from loading until those calls either make it through or time out. Occasionally I have to SIGSTOP my main browser and open a different one if I need to access something online right away. Even pages of ostensibly static content, like years-old news articles, now are littered with "web 2.0" doodads on them which do this kind of crap.
I currently have 42 tabs open in Chrome (in two separate windows). Yes, it's like a todo list. It would work better if I had a mechanism to de-duplicate tabs that were open to the same URL - sometimes I find that I've got three tabs open all monitoring the same CI build. But I also keep several JIRA bugs open in tabs so I don't forget them, two Gmail accounts and twitter, I've got five-ish articles that I was in the middle of reading, some reference documents for a few projects I'm in the middle of, a couple of youtube videos that I haven't found time to watch yet...
That was not the question - I am paying to have a small office to reduce my distractions, and allow focusing. I am just interested in how people manage the distractions, and with 100 tabs open I would presume that they are not all open regarding the same single task at hand.