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Firefox Headless ---Screenshot not working for local HTML files

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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
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
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Firefox/60.0

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17690 solutions 160039 answers

This could be related to this pref:

  • privacy.file_unique_origin = false

See also this thread for some remarks when I tested headless mode:

This could be related to this pref: * privacy.file_unique_origin = false See also this thread for some remarks when I tested headless mode: * [/questions/1256647] Headless Firefox doesn't work
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