Update manifest ... did not contain an updates property

My Firefox was started from an ubuntu-bug command, so I get to see standout output and standard error from firefox that normally gets ignored when firefox is started via the unity dash.

These messages were emitted from firefox:

402683097186 addons.repository WARN Unknown type id when parsing addon: 5

1402683097189 addons.repository WARN Unknown type id when parsing addon: 5

1402683097319 addons.update-checker WARN Update manifest for <email address hidden> did not contain an updates property

1402683097399 addons.update-checker WARN Update manifest for {2e1445b0-2682-11e1-bfc2-0800200c9a66} did not contain an updates property

1402683097424 addons.update-checker WARN Update manifest for <email address hidden> did not contain an updates property

1402683097427 addons.update-checker WARN Update manifest for {972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property

1402683097469 addons.update-checker WARN Update manifest for <email address hidden> did not contain an updates property

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xul-ext-ubufox 2.9-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jun 13 11:13:45 2014
InstallationDate: Installed on 2012-10-18 (603 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
PackageArchitecture: all
SourcePackage: ubufox
UpgradeStatus: Upgraded to trusty on 2014-04-12 (62 days ago)