fix(FirefoxLauncher): use wait-for-process option on Windows #6315
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Without
--wait-for-process
,puppeteer.launch
returns before Firefox is ready on Windows, so this should be part of the default Firefox arguments on that platform.On Windows, firefox.exe starts a "launcher process" that is responsible for configuring and starting the "real" browser process. Passing
--wait-for-process
makes that launcher process wait for the entire life of the browser process, and will also propagate the browser process's exit code as its own.Note that the test highlighted in #5673 is still expected to fail because
BrowserRunner
doesn't track the right process on Windows, which breaks itsclose
callback.