Also. Not a new issue but still exists and isreally annoying:
Openhab UI hangs until I close another Openhab browser tab - Setup, Configuration and Use / Runtime - openHAB Community
Enable http/2 for https & Set Keep-Alive header for http · Issue #4466 · openhab/openhab-core
Looks like there is not really a workaround right now? Currently i’m always working with 3 Browsers to do configuration. Edge, Chrome and Firefox with only one tab open in each.