Why do some web pages never finish loading?

I use Firefox. On the tabs, open at the top of the page, if I refresh the page and it’s reloading a green, spinning circle appears. Why is it that on some pages, that circle is there constantly? Is that page constantly refreshing or something?

I’ve been noticing this from time to time myself on various websites. I don’t think it’s browser related, since you’re running Firefox and I’m running Chrome.

I can’t specifically say what it is in your case, but I have several ides of what it might be, and I kind of sort of know what it is in mine.

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