Firefox crashes when printing. Tried resetting FF Printer Settings, No "print_printer" file.

Question

Also tried "Reset all FF printer settings", no "print_" files.

Answer 1

'''print_printer''' isn't a '''''file''''' it is a '''preference''' that appears in the '''''prefs.js''''' file once a pref is "userset". Plus, those type of prefs appear in the advanced prefs window - about:config - whether they're "userset" or "default" value prefs.
https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox#w_reset-firefox-printer-setting
Quite honestly though, "we" might be better off trying to troubleshoot your crashes from the Crash Report ID#'s rather than resetting preferences.
#Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
#Copy the '''5''' most recent Report IDs that start with '''bp-''' and then go back to your forum question and paste that into the "Post a Reply" box. (Please don't take a screenshot of your crashes, just copy and paste the ID's. The below image is just an example of what your Firefox screen should look like)
:[[Image:aboutcrashesFx29|width=500]]
Thank you for your help!
More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.