So a (5xx) service outage like a Service Unavailable error (HTTP Error 503, is seen by the users, but not detected nor reported by the extension.
I am wondering if it would be a feasible RFE to let the extension register the interaction with the URL at activating until the actual page is loaded, and report back possible service outage back to the platform.
Somewhat related to this topic: Solved: Re: Can we capture Browser Failed Error in Browser Extension ? - Dynatrace Community
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If there is a 'friendly' error page then the JS can be injected and data returned.
I would say you would be looking to catch issues such as this server side in 500s showing up on the frontend services or through synthetic monitoring.