When right-clicking on a snapshot and selecting view details, the following error occurs:
XML Parsing Error: undefined entity
Location: chrome://ec2ui/content/dialog_snapshot_details.xul
Line Number 29, Column 11: <label control="ec2ui.snapshot.description" value="&ec2ui.volumes.description.label;" />
----------^
The worst part about this error message is that it renders the browser inoperable, and one must shutdown the browser and restart it to regain control.