flatpak -v run org.mozilla.FirefoxDevEdition
F: No installations directory in /etc/flatpak/installations.d. Skipping
F: Opening system flatpak installation at path /var/lib/flatpak
F: Opening user flatpak installation at path /home/nackt/.local/share/flatpak
F: Opening user flatpak installation at path /home/nackt/.local/share/flatpak
F: Opening system flatpak installation at path /var/lib/flatpak
F: Opening user flatpak installation at path /home/nackt/.local/share/flatpak
F: Opening system flatpak installation at path /var/lib/flatpak
F: Cleaning up unused container id 709945912
F: Allocated instance id 450408302
F: Add defaults in dir /org/mozilla/FirefoxDevEdition/
F: Add locks in dir /org/mozilla/FirefoxDevEdition/
F: Allowing dri access
F: Allowing homedir access
F: Allowing wayland access
F: Allowing x11 access
F: Allowing pulseaudio access
F: Pulseaudio user configuration file '/home/nackt/.config/pulse/client.conf': Fehler beim Öffnen der Datei »/home/nackt/.config/pulse/client.conf«: Datei oder Verzeichnis nicht gefunden
F: Allowing session-dbus access
F: Running 'bwrap --args 36 xdg-dbus-proxy --args=38'
F: Running 'bwrap --args 36 firefox'
JavaScript error: resource://gre/modules/AddonManager.jsm, line 850: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIStringBundle.GetStringFromName]
1555660694156   Marionette      FATAL   XML-Verarbeitungsfehler: Nicht definierte Entität
Adresse: chrome://browser/content/browser.xul
Zeile Nr. 962, Spalte 7:      <menuitem id="context-savelinktopocket"
------^
JavaScript error: resource://gre/modules/AutoCompletePopup.jsm, line 112: NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIObserverService.removeObserver]