When I click in the start page of JOSM to one of the links (e.g. "22.08.2018 (stabile Version 14178)"), I get an error "Der vorgegebene Internetnavigator konnte nicht gestartet werden." (The default Internet browser could not be started). I use Ubuntu 16.04 with XFCE and the actual Firefox is my default Internet browser. I tried to change it with "sudo update-alternatives --config x-www-browser" and "sudo update-alternatives --config gnome-www-browser", -> same problem.

When I click in the start page of JOSM to one of the links (e.g. "22.08.2018 (stabile Version 14178)"), I get an error "Der vorgegebene Internetnavigator konnte nicht gestartet werden." (The default Internet browser could not be started). I use Ubuntu 16.04 and the actual Firefox is my default Internet browser.