Add-ons devs heads up: we are killing old bookmarks GUIDS.
If you don't manage an add-on that is using Places bookmarks GUIDs, you can stop reading here.
About making singleton XPCOM js services
Currently defining a new XPCOM component in javascript has no implications regarding createInstance. This means any code or add-on may instance your component multiple times, even if you intended to make it service-like.
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