Currently, there's no support in JOSM to view @panoramax photos by their unique identifier, similar to what #tag2link in core JOSM has done for #Mapillary links.

Luckily, we can use #utilsplugin2 custom url, and you can try the following entries.

To view a specific photo associated with the selected OSM element using a panoramax key:

`https://panoramax.openstreetmap.fr/#focus=pic&pic={panoramax}&speed=250`

To view available images around the bbox: `https://panoramax.openstreetmap.fr/#focus=map&map=21.57/{#lat}/{#lon}&speed=250`

Map-py new year! 🎉