In the case of RDD, Preferences::InitStaticMembers is getting a null prefService here[1]. [1] https://searchfox.org/mozilla-central/source/modules/libpref/Preferences.cpp#3540
Bug 1539029 Comment 7 Edit History
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In the case of RDD, Preferences::InitStaticMembers is getting a null prefService here[1]. Preferences::GetInstanceForService is not called. [1] https://searchfox.org/mozilla-central/source/modules/libpref/Preferences.cpp#3540