(That's new, I've never had recaptcha show the checkbox as red on me before, and refuse to let me click it)
I'm very very interested to learn more about ways to actively solve these kinds of issues.
Because here's the thing: the laptop I'm on right now is a spare machine I won't be using permanently, and I also have another laptop. The other laptop is a bit faster than this one, and has 4GB. I don't use it as much as this one though - so I close tabs on it less often. AFAIK, it has 643 tabs open at the moment.
I also have a couple of other PCs - one has 4GB RAM, the other 8GB. The one with 8GB is on indefinite loan to a family member until they get a new laptop. Eventually I'll be able to get that one back, but I'll be able to get the 4GB desktop up and running soon as well. That has an i3 in it and will be able to handle Chrome's thrashing a lot better than this ThinkPad does.
I used to be using the 8GB machine (when it too had 4GB) a lot, and I remember being able to open nearly 1000 tabs on that box before it keeled over completely.
The reason is quite obivous: I don't want to "close" tabs. I want the browser to do it for me.
I like absorbing and cataloging tons and tons of information so that I can improve my worldview. I do most of my reading on sites like Hacker News, where I'll open easily 20 or 30 articles at a time. Most of the things I find on there (each of which I open in a new tabs) will produce new trains of thought, and each idea will get opened a in new tab of its own - and before I know it I have on the order of 150 new tabs open.
That's simply how some people browse the web. It's so so sad that browsers use a process model to handle tabs _and_ don't also provide a suspension/hibernation mechanism. Tab hibernation is totally possible, and would solve SO MANY problems... I honestly don't understand why no browser vendor has implemented it.