Using Firefox with Gnome-Orca the caret becomes unresponsive and Orca access keys such as headings buttons edit fields stop responding.

Normal navigation using Orca and Firefox 28, after a while Orca will become non responsive. The access keys an Orca user would normally use such as H to jump to next heading or B to find next button stop working. Orca is still aware that it is in Firefox and re-loading the Orca preferences seem to fix the problem. Can not re-produce this outside of Unity whilst using Gnome-shell and had previously tried downgrading Firefox, that does not seem to fix the problem. To re-produce simply use Firefox for a while with Orca openning links in new pages and closing them for a couple of minutes, or typing in edit fields the edit text will become unreadable and the bug will become apparent. I have also raised this bug with Gnome-a11y on IRC and they seem to not be aware of it therefore I think it is Unity specific.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140321-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Wed Mar 26 04:42:10 2014
InstallationDate: Installed on 2014-03-01 (24 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140228)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)