Questions[dialog](ubuntu)

After upgrading to Ubuntu 19.04, I have noticed a visible freeze of a couple of seconds whenever I click a button of a Gnome dialog window. One case when it appears is the screen unlock window, but even the "open file" dialog in most applications gives the same behaviour.

Journalctl displays some error messages that appear to be related [EDIT: the messages were a red herring apparently; they do not appear at the same time as the bug happens.]

Any ideas as to what could be causing it? Is it a known problem? Any experiment

I am learning Japanese and installed the OS in Japanese to immerse myself in the language. Sometimes I want to copy messages from windows, menus and dialog boxes so that I can look them up on the dictionary, but I cant. I saw that there there many options for doing this in Windows. Are there any similar options available for Ubuntu?

Update: There is a new and very general solution available now. It works with Firefox and other GTK apps running in KDE. See the DK Bose's answer.

Original question:

I want to use KDE file dialogs (file open, file save) in Firefox in Kubuntu 12.04.

This requires something like the ancient KGtk script, but for KDE 4.x and recent Firefox versions.

OpenSuse offers this kind of functionality. Kubuntu dropped it, but surely someone has worked on bringing this back to Kubuntu (I hope).

Note, I'm not asking about theming/looks. I'm asking about actually using KDE file dialogs instead of XUL or GTK dialog.

And the preference ui.allow_platform_file_picker doesn't affect this. I have already tried setting it to true and false. Neither options results in using KDE dialogs.

Not sure of the terminology here, but most of my popup dialogs (see screenshot below) are attached to the window title and cannot be moved. If the parent window is moved, the popup moves with it. Is there a way to get rid of this and have all popup dialogs be opened as movable windows?

Ubuntu 17.10+ with GNOME Shell

Ubuntu 11.10 with Cinnamon

I restarted Ubuntu a few minutes ago, and got a warning dialog early in the bootup process (before the desktop was up)...

It wasn't just a scrolling message which flitted off the screen of its own accord.
It was a dialog which stopped proceedings, until I acknowledged it.

Could not update ICEauthority file /home/me/.ICEauthority  

What, Why, and Who dun it? :)