Guessing this is from bug 1561443 as it added this code: https://searchfox.org/mozilla-central/rev/23f836a71cfe961373c8bd0d0219ec60a64b3c8f/browser/base/content/aboutNetError.js#355-366 `errorCodeStr` should be PR_CONNECT_RESET_ERROR as it's shown as-is slightly below {$errorMessage} So `errorCodeMsg` seems like it's trying to get localied pr-connect-reset-error, which does not exist. "ssl-connection-error" does get `hostname` just not `errorMessage` as shown attached.
Bug 1584585 Comment 0 Edit History
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Guessing this is from bug 1561443 as it added this code: https://searchfox.org/mozilla-central/rev/23f836a71cfe961373c8bd0d0219ec60a64b3c8f/browser/base/content/aboutNetError.js#355-366 `errorCodeStr` should be PR_CONNECT_RESET_ERROR as it's shown as-is slightly below {$errorMessage} So `errorCodeMsg` seems like it's trying to get localized `pr-connect-reset-error`, which does not exist. "ssl-connection-error" does get `hostname` just not `errorMessage` as shown attached.