In helping a corporate user log on to eBay, I noticed that when on the login page, a stream of errors were coming up in the Firefox JS Console about not being able to connect to
wss://localhost. This is a bit concerning, obviously. Why would a web site need to connect to a web server running locally.
In looking further, I found that this request comes from
check.js at this URL:
Is this some malicious script injected into eBay or do they have a legitimate reason for doing that? Anybody knows?