Hi, is there any possibility to use another filedialog for firefox?
Yes, you can hack around, to force it to a different dialogue. But I’ve never done that. Also your question is very vague.
Theoretically yes, practically not so much.
Firefox nowadays uses the XDG desktop portal when available to request a file dialog from the system.
So in theory you can change the component that provides the file dialog with another implementation.
However, there aren’t many of them. The GTK portal provides the generic one. And GNOME and KDE both have their own implementation, but these are build to work inside their desktops and not really to be used separate from it.
And there isn’t really an independent file manager that has implemented a portal implementation as of now.
So, unless we see some independently working file chooser portal implementations, you’re probably best off with using the system provided one.