I made no override to .desktop files Marco.

$ ls -la /usr/share/applications/firefox.desktop
ls: cannot access '/usr/share/applications/firefox.desktop': No such file or 
directory

$ ls -la ~/.local/share/applications/firefox.desktop
ls: cannot access '/home/MYUSER/.local/share/applications/firefox.desktop': No 
such file or directory

$ ls -la /var/lib/snapd/desktop/applications/firefox_firefox.desktop
-rw-r--r-- 1 root root 27211 Apr  1 15:15 
/var/lib/snapd/desktop/applications/firefox_firefox.desktop

$ cat /var/lib/snapd/desktop/applications/firefox_firefox.desktop
[Desktop Entry]
X-SnapInstanceName=firefox
Version=1.0
Type=Application
X-SnapAppName=firefox
Exec=/snap/bin/firefox %u
Terminal=false
Icon=/snap/firefox/current/default256.png
StartupWMClass=firefox_firefox
Categories=GNOME;GTK;Network;WebBrowser;
MimeType=application/json;application/pdf;application/rdf+xml;application/rss+xml;application/x-xpinstall;application/xhtml+xml;application/xml;audio/flac;audio/ogg;audio/webm;image/avif;image/gif;image/jpeg;image/png;image/svg+xml;image/webp;text/html;text/xml;video/ogg;video/webm;x-scheme-handler/chrome;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/mailto;
StartupNotify=true
Actions=new-window;new-private-window;open-profile-manager;
Name=Firefox
Name[ach]=Firefox
Name[af]=Firefox
Name[an]=Firefox
Name[ar]=Firefox
...


$ snap info firefox
name:      firefox
summary:   Mozilla Firefox web browser
publisher: Mozilla✓
store-url: https://snapcraft.io/firefox
contact:   
https://support.mozilla.org/kb/file-bug-report-or-feature-request-mozilla
license:   unset
description: |
  Firefox is a powerful, extensible web browser with support for modern web 
application
  technologies.
commands:
  - firefox
  - firefox.geckodriver
snap-id:      3wdHCAVyZEmYsCMFDE9qt92UV8rC8Wdk
tracking:     latest/stable
refresh-date: today at 15:15 CEST
channels:
  latest/stable:    149.0-1      2026-03-26 (8054) 286MB -
  latest/candidate: 149.0-1      2026-03-24 (8054) 286MB -
  latest/beta:      150.0b3-1    2026-03-30 (8083) 289MB -
  latest/edge:      151.0a1      2026-04-01 (8088) 308MB -
  esr/stable:       140.9.0esr-1 2026-03-24 (8016) 258MB -
  esr/candidate:    140.9.0esr-1 2026-03-17 (8016) 258MB -
  esr/beta:         ↑                                    
  esr/edge:         ↑                                    
installed:          149.0-1                 (8054) 286MB -


And I'm still getting the same error when trying to drag a file ()in this case 
to Google Drive or Proton Drive

$ journalctl -f
Apr 01 16:00:11 t14flix xdg-document-portal[21614]: error: Invalid id 
firefox_firefox: Names must contain at least 2 periods

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2143896

Title:
  xdg-document-portal rejects Snap app IDs (firefox_firefox) breaking
  drag-and-drop

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https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2143896/+subscriptions


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