As a rule, XPCOM objects should not pass themselves to other objects within their constructor or destructor. nsPrefService's constructor fiddles with refcounts to be able to add itself to the observer service. This should be done using an init method. nsPrefService's destructor removes itself from the observer service. This is at the very least pointless.
nsPrefService no longer exists, and Preferences doesn't do any of the things mentioned in comment 0.
Status: NEW → RESOLVED
Last Resolved: 5 months ago
Resolution: --- → WORKSFORME
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