I don't see mention of this in the discussion, so I will add: I think people also don't close tabs. And probably these LI tabs have been up for a long time. Maybe weeks or months.
I completely exit my web browser(s) at least 1x per day, and use bookmarks to get back to pages I need. As a result, I don't have issues with memory leaks or unbounded growth of RAM use. For me, its just the "proper" way to use a program like a web browser, but I'm old enough to be from the era that restarting programs and the OS could fix issues. I recognize that most people feel it is unreasonable to quit the browser, pretty much ever.
I completely exit my web browser(s) at least 1x per day, and use bookmarks to get back to pages I need. As a result, I don't have issues with memory leaks or unbounded growth of RAM use. For me, its just the "proper" way to use a program like a web browser, but I'm old enough to be from the era that restarting programs and the OS could fix issues. I recognize that most people feel it is unreasonable to quit the browser, pretty much ever.