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How can I configure my browser to allow JavaScript-invoked printing of an iframe from a different domain?

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I have a particular application that needs to print arbitrary webpages sent from a server. I have a setup with Firefox 3.6 that allows me to do this by loading the page into an iframe and then calling printFrame.contentWindow.print() as an onload() listener. I work around the cross-domain restriction by setting the "capability.policy.default.Window.print" userPref to "allAccess" (and also work around the print dialog problem by setting "print.always_print_silent" to true).

However, when I try to upgrade to the current version of Firefox, this system no longer works. The "print.always_print_silent" setting is honored (I don't get print dialogs), but "capability.policy.default.Window.print" seems to be ignored; I can print URLs from the original domain, but URLs from other domains fail.

Is there a new setting that will enable the same behavior as "capability.policy.default.Window.print" used to? Or some other way to tell my Firefox installation to print an aribtrary URL without user intervention?

Additional System Details


  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0

More Information

The print request fails with Error: Permission denied to access property 'print', exactly as if I hadn't set "capability.policy.default.Window.print" to "allAccess".