"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P AJ --screenshot test.png "file:///C:/html_export.html"

   "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P AJ --screenshot test.png google.com

 [1]: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode
 [2]: https://bugzilla.mozilla.org/show_bug.cgi?id=1546062

I'm unable to generate a screenshot of a local HTML file using Firefox's (v60.9.0) [headless mode][1] Here's the command I'm using: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P AJ --screenshot test.png "file:///C:/html_export.html" I've tried with and without a profile and with different numbers of slashes after file. There are no errors in the command line - it just doesn't generate an output. This command works fine when I substitute the file:// with an external website like: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P AJ --screenshot test.png google.com Could it be related to the [redirect bug mentioned here][2]? Any help is appreciated! Perhaps theres a way to turn on output verbosity for --headless mode? [1]: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode [2]: https://bugzilla.mozilla.org/show_bug.cgi?id=1546062