In Bug 213431 we aim for run-minibrowser to become a Python script. But as the current logic to run MB on Mac platforms is implemented in webkitdirs.pm, that logic would need to migrate to webkitpy now. For now the old Perl script remains usable: 1. Python run-minibrowser hooks into webkitpy Port infrastructure and calls `run_minibrowser()` 2. The base Port `run_minibrowser()` method calls old-run-minibrowser On Darwin webkitpy Port subclasses this method should instead run the WebKit.app, the same way as webkitdirs.pm does it, and supporting the same command-line options.