My apologies for the late reply, I hadn't seen there was a Page 2 and was under the impression I went unanswered when it was the other way around, my mistake.
My NIC is set to private is it is a home network and that's always been the case, if that makes any difference.
Sorry for such a late reply again, I honestly don't understand the question. I'm familiar with plugins being saved to Jellyfin folders locally, but are they also installed to each web browser, or am I misunderstanding something?
*Another discovery*
A long time in the past, I connected to a friends server remotely using JMP.
Each time I open JMP, it always defaults to that one first, then giving me the option to switch servers and choose mine.
I looked at conf file;
C:\Users\user\AppData\Local\JellyfinMediaPlayer\jellyfinmediaplayer.conf
and noticed the "userWebClient": is set to the friend's server address.
I changed it to mine, but when JMP opens, it then has the same issue that web browser does; shows Jellyfin logo/splash then blank dark screen.
Changed it back to the friend's and I'm back to the workaround we started with.