I knew that printing silently was going to be broken and I'm working on a fix for that for bug 1189846, that means you can effectively print silently, but only when triggered from the parent process. However, I noticed a bug which causes a crash instead of just failing when you try it now.
Comment on attachment 8726242 [details] [diff] [review] Return an error when trying to Init an nsDeviceContextSpecProxy without a RemotePrintJob oops.
Attachment #8726242 - Flags: review?(jmathies) → review+
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