In firefox, when leaving the site, the browser makes some additional requests to the
Chrome does not do this.
In our case the site that is being requested has a loading animation that expects all requests to be resolved before showing the page, so these POST requests back to the forum add around a 25 second delay to the loading.
I don’t know why these POST requests take so long after having left the site, as they don’t take this long whilst browsing the site (is the discourse backend checking the referrer?)
Is it possible it’s related to this?