The system keeps flipping all the printer settings back to "User". Somehow it went into "User" setting 2 weeks ago, and I was able to correct the problem for a few days by following the instructions on the web page above, resetting just the print.print_printer line, alone. Now, ALL the other "print" lines  below this will NOT remain in "default" mode once I've closed the about:config page (tab), or closed the browser and re-opened it, under any circumstances. The problem manifests as:  When I try to print, starting from ANY true print command location and finally clicking "OK" to begin printing, I get a small rectangular box saying only, " an unknown error occurred while printing". The box has one of those yellow triangular signs with an exclamation point in it, if that helps. There's no error no.  If there's something about the WAY I'm supposed to close the about:config tab, and/or close the browser that is SPECIFIC, I hope someone here can tell me the way I'm supposed to execute this.  Thank you.

I have followed the instructions for resetting FFox printer interface to "default", where it should normally be, to the letter: http://kb.mozillazine.org/Problems_printing_web_pages#Reset_printer The system keeps flipping all the printer settings back to "User". Somehow it went into "User" setting 2 weeks ago, and I was able to correct the problem for a few days by following the instructions on the web page above, resetting just the print.print_printer line, alone. Now, ALL the other "print" lines below this will NOT remain in "default" mode once I've closed the about:config page (tab), or closed the browser and re-opened it, under any circumstances. The problem manifests as: When I try to print, starting from ANY true print command location and finally clicking "OK" to begin printing, I get a small rectangular box saying only, " an unknown error occurred while printing". The box has one of those yellow triangular signs with an exclamation point in it, if that helps. There's no error no. If there's something about the WAY I'm supposed to close the about:config tab, and/or close the browser that is SPECIFIC, I hope someone here can tell me the way I'm supposed to execute this. Thank you.