Firefox and xulrunner updates fail on Fedora-17

[Jonathan Ryshpan]

System is Fedora-17 with all updates (except these) running on x86_64 cpu.
Here's the yumex log of an attempt to update:

10:14:45 : network interface p6p1 (r8169) is connected
10:14:46 : Connected to an network
10:14:46 : network interface p6p1 (r8169) is connected
10:14:46 : Starting yum child process
10:14:50 : YUM: Yum Version : 3.4.3
10:14:50 : YUM: Loaded plugins: presto
10:14:50 : Getting available updates
10:14:52 : 2 packages returned
10:14:52 : Getting available obsoletes
10:14:52 : 0 packages returned
10:14:52 : Adding Packages to view
10:14:52 : Added 2 Packages to view
10:15:02 : YUM: --> Running transaction check
10:15:02 : YUM: ---> Package firefox.x86_64 0:18.0-1.fc17 will be updated
10:15:02 : YUM: ---> Package firefox.x86_64 0:18.0.2-1.fc17 will be an update
10:15:02 : YUM: ---> Package xulrunner.x86_64 0:18.0-6.fc17 will be updated
10:15:02 : YUM: ---> Package xulrunner.x86_64 0:18.0.2-1.fc17 will be an update
10:15:02 : YUM: --> Processing Dependency: nss >= 3.14.2 for package: xulrunner-18.0.2-1.fc17.x86_64
10:15:02 : YUM: --> Processing Dependency: nspr >= 4.9.5 for package: xulrunner-18.0.2-1.fc17.x86_64
10:15:02 : YUM: --> Finished Dependency Resolution
10:15:06 : ERROR: Dependency resolving completed with errors
10:15:06 : ERROR:   Package: xulrunner-18.0.2-1.fc17.x86_64 (updates)
    Requires: nss >= 3.14.2
    Installed: nss-3.14.1-3.fc17.i686 (@updates)
        nss = 3.14.1-3.fc17
    Available: nss-3.13.4-3.fc17.i686 (fedora)
        nss = 3.13.4-3.fc17
10:15:06 : ERROR:   Package: xulrunner-18.0.2-1.fc17.x86_64 (updates)
    Requires: nspr >= 4.9.5
    Installed: nspr-4.9.4-1.fc17.i686 (@updates)
        nspr = 4.9.4-1.fc17
    Available: nspr-4.9-2.fc17.i686 (fedora)
        nspr = 4.9-2.fc17