I recently upgraded to Ubuntu 24.04. I also migrated from using Thunderbird via snap to installing and running it via Flatpak. As a result, the Thunderbird icon on the dock now shows the normal logo with an annoying green circle with the number "1" in white text on top. I have uploaded the image. This suggests there is one new message but that is not the case - whether there are 0 new messages or 10 new messages, the icon in the dash does not change. How can I return to the original Thunderbird icon? I have checked the org.mozilla.Thunderbird.desktop file which is located in /usr/share/applications and and it says: Icon=thunderbird StartupWMClass=thunderbird-esr However, I have no idea where the thunderbird icon is located and how to replace it with my own .png file. I cannot find the current icon file anywhere. Does anyone know how to replace the current icon with my own icon or with the original Thunderbird icon?