I am writing a server running as a Windows service that, on request, calls Firefox to create a pdf snapshot of a web page.
I know that it is a bad idea to run a GUI program in service mode, but the nature of my program limits its launch in user mode. Starting a proxy at the user level is also not an option, since an interactive user cannot be on a computer with a running server.
In my experiments, Firefox successfully released pdf when the service started under a user account that was already registered. Obviously, this did not work in other cases: for local systems and user accounts that were not logged in. In LocalSystem with the option "Allow the service to interact with the desktop", I saw how Firefox began to report that it could not find the printer.
Since it would be impractical to require an open user session to start a pdf server, is there any workaround for this, except that it all comes from a virtual machine?
UPDATE: I realized that the problem was not with account permissions, but with the invisible modal dialog that FF expected while working in service mode.
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