Arbitrary userjs- preferences (as implemented per T42124) should be shown in the GUI, with the possibility of clearing them one-by-one. (They are currently only deleted when doing a full reset of preferences.)
Sister bug of T45959, which is the same, but for the API itself.
Version: 1.21.x
Severity: enhancement
See Also: T45959: action=options API should allow resetting of chosen preferences (instead of the all-or-nothing approach)