I don't think there is a reason for that. Coincidentally, :flowejam is tweaking that line in https://phabricator.services.mozilla.com/D205510, and that patch might simplify your work here.
Bug 1885695 Comment 15 Edit History
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I don't think there is a reason for that. Coincidentally, :flowejam is tweaking that line in https://phabricator.services.mozilla.com/D205510 (bug 1885693), and that patch might simplify your work here.