According to bug 562239 comment 5 we want to not shown "Unknown" when the last update date is not known. But it seems that was missed, and we still show it.
Per policy at https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Inactive_Bugs. If this bug is not an enhancement request or a bug not present in a supported release of Firefox, then it may be reopened.
Status: NEW → RESOLVED
Last Resolved: 8 months ago
Resolution: --- → INACTIVE
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