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@Anton: That's what I was guessing. If we had a unit test in test_webbrowser that did the same thing, we'd have seen the resource warning when running the tests and fixed it. However, it looks like there aren't *any* tests for webbrowser, not even in test_sundry (which just makes sure modules without tests are importable).
So adding a test that will trigger this resource warning requires setting up a test_webbrowser file first, even before we get to the problem of how to test something that wants to start up a web browser...(but that should be solvable with unittest.mock, I think).