Blue ocean and Firefox Quantum (don't know about earlier versions of FF) do not play well together. It seems as if the event source breaks as part of page loading. I see this error message in the dev console of FF:

The connection to https://<url-redacted>.com:8443/sse-gateway/listen/jenkins-blueocean-core-js-1510819176806-8g0ww was interrupted while the page was loading.

Not knowing much about the implementation of the UI I assume the above is what prevents the UI from updating the status. I have to resort to page reloads to get updates... or use Chrome ofc but I would much rather use Firefox.