Re: Plasma file dialogs in Thunderbird

	Thank you a thousand times for sharing this page which documents the obscure 
values for Firefox's extended configuration interface!

Leslie

On 2026-06-07 19:06:53 David C Rankin wrote:
> On 6/7/26 11:46 AM, Andrei Borzenkov wrote:
> > 07.06.2026 18:58, gumb via openSUSE Users wrote:
> >> On 07/06/2026 15:03, Andrei Borzenkov wrote:
> >>> Configuration editor - widget.use-xdg-desktop-portal.*
> >>>
> >>> 15.6 had kmozillahelper which is no more present in 16.0 (and is auto-
> >>> removed on update).
> >>>
> >>> You did not say where your Firefox comes from.
> >>
> >> My Firefox is also the standard esr version from the oss repo. By
> >> comparing the entries in about:config for both FF and TB for the various
> >> entries under widget.use-xdg-desktop-portal.* I could see one
> >> difference.
> >>
> >> widget.use-xdg-desktop-portal.file-picker was set to 2 in Thunderbird,
> >> but was showing 1 in Firefox,
> >
> > Indeed. It is set by the MozillaFirefox-branding-openSUSE package.
>
> I found a helpful search of the firefox source code that will pull in
> all the settings and value for each of the about:config settings:
>
> https://searchfox.org/firefox-release/source/browser/app/profile/firefox.js
>
> For example searching "widget.use-xdg-desktop-portal" pulls in:
>
> # Whether to use gtk portal for the file picker.
> #  - 0: never
> #  - 1: always
> #  - 2: auto (true for flatpak or GTK_USE_PORTAL=1, false otherwise)
> - name: widget.use-xdg-desktop-portal.file-picker
>    type: int32_t
>    value: 2
>    mirror: always
>
> # Whether to use gtk portal for the mime handler.
> #  - 0: never
> #  - 1: always
> #  - 2: auto (for now only true for flatpak, see bug 1516290)
> - name: widget.use-xdg-desktop-portal.mime-handler
>    type: int32_t
>    value: 2
>    mirror: always
>
> # Whether to use XDG portal for native messaging.
> # https://github.com/flatpak/xdg-desktop-portal/issues/655
> #  - 0: never
> #  - 1: always
> #  - 2: auto (true for snap and flatpak or GTK_USE_PORTAL=1, false
> otherwise)
> - name: widget.use-xdg-desktop-portal.native-messaging
>    type: int32_t
>    value: 0
>    mirror: always
>
> # Whether to try to use XDG portal for settings / look-and-feel
> information. #
> https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.
>Settings #  - 0: never
> #  - 1: always
> #  - 2: auto
> - name: widget.use-xdg-desktop-portal.settings
>    type: int32_t
>    value: 2
>    mirror: always
>
> # Whether to use XDG portal for geolocation.
> #
> https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.
>Location #  - 0: never
> #  - 1: always
> #  - 2: auto
> - name: widget.use-xdg-desktop-portal.location
>    type: int32_t
>    value: 2
>    mirror: always
> # Whether to use XDG portal for opening to a file.
> #
> https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.
>OpenURI #  - 0: never
> #  - 1: always
> #  - 2: auto (true for flatpak or GTK_USE_PORTAL=1, false otherwise)
> - name: widget.use-xdg-desktop-portal.open-uri
>    type: int32_t
>    value: 2
>    mirror: always
>
> I've always had problems with the xdg-desktop-portal mess. This
> reference has helped with both openSUSE and Arch desktops. The setting
> of 2 (auto) on widget.use-xdg-desktop-portal.file-picker has always
> worked best for me on different desktops (providing the default GTK
> dialog if no other is found) 1 (always) has left me without any
> file-pickers on occasion.