Icon for Firefox parallel instance .desktop file does not show in dock when running

[ashre]

I run multiple Firefox instances in order to have an app that just contains my Nextcloud calendar (like a electron style app for one purpose). I have a custom calendar.desktop file for that. That all used to work fine and then Ubuntu changed to snap Firefox. After some fiddling it worked but now on a recent update I see a gears icon in the dock when I run the app instead of getting a dot next to the icon and when alt-tabbing I don’t see the custom icon (though it shows up for the app when not launched). Using looking glass I looked at the gtk_application_id and it is null or in the window list.

Here is the .desktop file:

[Desktop Entry]
Name=Calendar
Comment=Firefox just for calendar
Exec=env BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox+parallel_firefox.desktop /snap/bin/firefox_parallel %u -P Calendar -no-remote --new-window https://calendar.example.com --name calendar --class calendar
Icon=/usr/share/icons/hicolor/scalable/apps/icon-calendar.svg
StartupWMClass=calendar
Keywords=Calendar;Schedule
Version=1.0
GenericName=Web Browser duplicate
Terminal=false
Type=Application
Categories=GNOME;GTK;Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
StartupNotify=true

And here is the instructions on getting parallel instances of firefox to work with snap:

Run parallel installs at the same time

It seems related to this thread:

SVG icon in .desktop file no longer shows in Dock when app opens (gear icon instead)

I have a PPA for my app that I just updated for Ubuntu 22.04. Things have changed since 20.04, and while the app icon shows well in the Dock before opening the program, or when I search in the Activities overview. When I open the program a new gear icon appears though, instead of my icon. This was not the behavior on 22.04. desktop-file-validate told me that I should remove the .svg extension from the name of the icon in the .desktop file, and debuild would not work without this removal. Wo…

Any help would be very welcome.

[skeller (Sebastian Keller)]

The wm-class property is more relevant here, the gtk_application_id is only used as a fallback and I don’t think Firefox sets or uses it. If those don’t match the file name of the .desktop file or the StartupWMClass, then gnome-shell won’t be able to associate the windows with the app. Setting this is the responsibility of the client, so maybe a Firefox specific support forum might be able to help you better with this.