Thought: program hibernation

I can hibernate my laptop so it doesn't drain the battery when I'm not using it. What if I could hibernate individual programs, like my web-browser?

I usually have scores of web-pages open in my browser, and just having it open, even if I'm not actually using it, uses the processor -- often quite a lot of it -- and drains the battery.

So I might leave the house in the afternoon to go out and do some PhD writing at a coffee shop. I won't be using the browser there, and I don't want it to drain the battery, so it'd be nice if I could hibernate it.

That'd be quicker and easier for me than manually closing it down and then manually reloading it all, and guarantee that when I bring it back up everything is in the exact same state.

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Current operating systems may have quirks that wouldn't make this feasible, but of course that doesn't mean there's anything inherently impossible about the idea.