I’m using Firefox and LibreWolf on the latest version of Silverblue. If I sign into a Firefox Sync account in the RPM version of Firefox, clicking the “hamburger” menu in the upper right hand corner (the three lines) works fine. However, if I log in to Sync from the flathub versions of Firefox or LibreWolf, clicking that button gives:
In addition, note that you said firefox as installed from rpms directly from fedora works, but the flatpak has an issue. Fedora does not provide the flatpak so the issue seems to originate from wherever that flatpak was created.
$ flatpak list | grep -iE 'firefox|librewolf'
LibreWolf io.gitlab.librewolf-community 114.0.2-1 stable flathub system
Firefox org.mozilla.firefox 115.0 stable flathub system
Both Flathub.
I will raise the issue with Mozilla, but since many Silverblue users are Flathub Firefox users, I’m surprised no one else has run across this. Give this, I thought it worth asking here…