How to overwrite built in XPCOM component in Firefox addon?

You need to register your component using the contract id of the service that you want to override.

Neil, thanks for the suggestion. That's what I thought I was doing (and I was), but if you're actually overriding a contract (instead of defining a new one), it looks like the answer is that you have to go to the nsIComponentRegistrar and actually register your factory (rather than relying on the chrome. Manifest to handle it for you).

An example of this would be.

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