Firefox is not being updated in Silverblue 31. It means that we need to use Firefox from Flatpak? But it’s not possible to install Firefox because of this error https://github.com/flatpak/flatpak/issues/2976

If you look at the firefox page in Koji, it looks like the F31 builds of fireox had been failing lately - https://koji.fedoraproject.org/koji/packageinfo?packageID=37

Last successful build was firefox-68.0-5.fc31 on July 17. And that was included in the most recent Rawhide/F31 ostree compose:

$ sudo ostree pull --commit-metadata-only --depth=1 fedora:fedora/rawhide/x86_64/silverblue

GPG: Verification enabled, found 1 signature:

  Signature made Sun 21 Jul 2019 02:20:42 AM EDT using RSA key ID 50CB390B3C3359C4
  Good signature from "Fedora <fedora-31-primary@fedoraproject.org>"
Receiving metadata objects: 3/(estimating) 22.6 kB/s 67.9 kB                                                                                                                                                       

GPG: Verification enabled, found 1 signature:

  Signature made Sat 20 Jul 2019 12:56:11 PM EDT using RSA key ID 50CB390B3C3359C4
  Good signature from "Fedora <fedora-31-primary@fedoraproject.org>"
4 metadata, 0 content objects fetched; 100 KiB transferred in 4 seconds                                                                                                                                              

$ ostree rev-parse fedora:fedora/rawhide/x86_64/silverblue
51b5f5287a15f02e7ba4ed316ad8ee66c0f41aa1a6e767432b83dafdab799e1a

$ rpm-ostree db list 51b5f5287a15f02e7ba4ed316ad8ee66c0f41aa1a6e767432b83dafdab799e1a | grep firefox
 firefox-68.0-5.fc31.x86_64