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SUMMARY
plasma-integration extension not working on Firefox Snap 130.0.1 (64 bit)
The extension says: An unexpected error occurred. The connection with the native server has failed.
The apparmor solution does not apply:
sudo ln -s /etc/apparmor.d/usr.bin.firefox /etc/apparmor.d/disable/
sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox
ln: fallo al crear el enlace simbólico '/etc/apparmor.d/disable/usr.bin.firefox': El archivo ya existe
File /etc/apparmor.d/usr.bin.firefox not found, skipping...


STEPS TO REPRODUCE
1. Install Ubuntu
2. Run Firefox
3. Install Plasma Integration

OBSERVED RESULT

An unexpected error occurred. The connection with the native server has failed.

EXPECTED RESULT

The extension works

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Kubuntu 24.04.1/5.27.11
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13

ADDITIONAL INFORMATION