Its been a couple of years since Ive used the Mozilla libraries and some of the functionality now seems iffy

For example  print preview requests now generate an invalid pointer error

error[Exception... "Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIWebBrowserPrint.printPreview]" nsresult: "0x80004003 (NS_ERROR_INVALID_POINTER)" location: "JS frame :: chrome://testbrowser/content/proofer.xul :: previewprint :: line 119" data: no]

Tried the FAQ for print preview and along with all the other FAQ documents, they seems to be unavailable on MDN

Has the calling syntax for print preview changed ?

Is this just a general depreciation in support for application development?
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