Please consider turning on send info to Mozilla before posting a question. This helps us help you. As I have no info from your system that would help see things that cause issues.

Note : Windows 10 can and will change your hardware drivers to Microsoft's. Check Device Manager to make sure running the proper drivers. https://www.howtogeek.com/302595/how-to-stop-windows-10-from-automatically-updating-hardware-drivers/

Go to Printer Manufacturers Website and check to see if they supply drivers for Win10 or Win 10 does. If New drivers please download.

Please uninstall version 56.0 and update to current version 56.0.2 https://www.mozilla.org/firefox/all/ Full Version Installer Note : Firefox 57 Quantum release date Nov 14th https://www.mozilla.org/en-US/firefox/quantum/ Note : Legacy Extensions will be disabled and or removed.

https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox and http://kb.mozillazine.org/Problems_printing_web_pages and https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems?redirectlocale=en-US&redirectslug=Troubleshooting+extensions+and+themes

Please let us know if this solved your issue or if need further assistance.

I have tried most of your suggestions and nothing has made a difference.

I think I'm sending info to Mozilla - have reset - reinstalled - checked drivers but still same result any other suggestions.

Printer works fine with other programs

Thanks

Delete Mozilla Firefox folders in C:\Program Files and c:\Program Files (X86) Cleanup using Windows Disk Cleaner then run it again and Clean System Files. Reboot

Uninstall and update to the current version 56.0.2 https://www.mozilla.org/firefox/all/ Full Version Installer

Then create a new profile. Then https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Please let us know if this solved your issue or if need further assistance.

You can try to set this pref to 0 (or 1) on the about:config page to lower the sandbox security setting.

• security.sandbox.content.level = 0
• close and restart Firefox to make the change effective.

If this didn't work then undo/reverse the change and reset the pref via the right-click context menu to the default value.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

I have found a solution if I use Chrome I can print - immediately - this is not the solution I wanted as I have used Firefox for years but if it works?

Well you said you tried many of the solutions I suggested. You make no mention of following cor-el's information.

So it is hard to help someone when you do not follow directions and or comment on such.

Have you tried going to the Manufacturers Site of your printer to see if the have updated drivers and interface. Every printer/scanner I bought I never opened the CD that came with it. I went online and found the newest version of their software.

Printing in Chrome is not a Firefox solution.

I understand that this is not a Firefox solution I was just eliminating there being something wrong with the printer.

I tried altering the sandbox setting to zero and still get the same error - out of paper on the printer