For the record, the new article https://support.mozilla.org/en-US/kb/add-custom-search-engine-firefox was approved and marked ready for localization on Jun 24, 2025.
Bug 1968233 Comment 8 Edit History
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For the record, the new article https://support.mozilla.org/en-US/kb/add-custom-search-engine-firefox was approved and marked ready for localization on Jun 24, 2025. (See bug 1967739 comment 5 on adding a SUMO article link to the Firefox 140 release notes.)