Old discussions raised in about 2005 or earlier in all forums, with a sample in this forum:
2007: How can I make Firefox use KDE file dialog boxes ?
Using the oldish poor featured gtk file-picker in a modern environment was hard to accept.
Even the possibility to use the qt file picker had been removed in Firefox ( ui.allow_platform_file_picker setting )
Now some news for KDE users: solution identified for Firefox > V64
Code: Select all
sudo apt install xdg-desktop-portal xdg-desktop-portal-kde
Code: Select all
GTK_USE_PORTAL=1 <path to firefox>/firefox
Tested / Approved.