Since this bug is located in the "pywebkitgtk" component and seems to be about the underlying crash, I've moved my band-aid patch (from comment 7) to bug 448703. Let's keep this bug here focused on the underlying crash, while bug 448703 can be about a cosmetic fix to avoid the crash in ubiquity. Sorry for the bugspam.
Since this bug is located in the "pywebkitgtk" component and seems to be about the underlying crash, I've moved my band-aid patch (from comment 7) to bug 448703. Let's keep this bug here focused on the underlying crash, while bug 448703 can be about a cosmetic fix to avoid the crash in ubiquity. Sorry for the bugspam.