Optional
Readonly
domainURIs of the scopes in which this change applies.
Optional
Readonly
newThe new value of the changed preference.
Optional
Readonly
oldThe old value of the changed preference.
Readonly
preferenceThe name of the changed preference.
Readonly
scopeThe PreferenceScope of the changed preference.
Representation of a preference change. A preference value can be set to
undefined
for a specific scope. This means that the value from a more general scope will be used.