From [the docs](https://firefox-source-docs.mozilla.org/devtools/contributing/landing-code.html): This has been replaced by the same named Phabricator tag.
Bug 1623760 Comment 0 Edit History
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From [the docs](https://firefox-source-docs.mozilla.org/devtools/contributing/landing-code.html): >Another route is to request the landing using Bugzilla. Go to the bug, and add checkin-needed to the Keywords field. This has been replaced by the same named Phabricator tag.