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I use uMatrix, and I've seen localhost show up as a domain a site tried to connect to quite a few times. I never gave it too much thought since I block all non-first-party resources by default anyway, but I now realise it could indicate the use of tricks like this to attempt to communicate with some other process running on my computer. I'll now make sure to look closer whenever I see this. I bet Zoom isn't the only one doing things like this.