Go to <https://support.mozilla.com/en-US/contributors/unreviewed>. There's an article in the list, called "Firefox 4". It links to https://support.mozilla.com/en-US/kb/What%20is%20a%20slug?/history which doesn't exist.
I close it as workforme
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → WORKSFORME
Someone must have deleted the article.
Status: RESOLVED → VERIFIED
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