Web Compatibility Support • stackoverflow.com - infinite loading

This is just something I've been observing on this particular website for months, it happens sometimes that the website seems to load normally, but browser is still showing that it's loading (spinning circle on the tab, downloading data from website label in the status bar) virtually forever until you stop it.

Just wondering if someone noticed it too or am I again an oddball.

I haven't a clue what triggers it.