Robert Krawitz wrote:
On Sun, 12 Aug 2018 11:57:09 -0400, [email protected] wrote:
On 08/12/2018 10:58 AM, [email protected] wrote:
In Chrome, the headers are at 0.33" from the top, the footers are at
.18" from the bottom, when the margins are moved to their placement on
the screen.

WRT Firefox: I don't know if this information will help, but in the
preferences file (aka about:config), print_print_margin_top and
print_print_margin_bottom both show (as string) 0.5 for the value, but
if this actually means 1/2" from both top and bottom, the headers and
footers print closer than that to the top and bottom of the pages. The
preferences print_print_unwriteable_margin_top and
print_print_unwriteable_margin_bottom both show (as integer) 13 as the
value. I'm not finding a setting anywhere to manually change the
margins in Firefox.

Fixed in Firefox.  :-)

The "print_print_unwriteable_margin_" entries required changing. Advanced/Power 
users would know to look in about:config for this, otherwise there is no GUI to change 
the margins.
It should be getting that from the PPD file, but apparently the PPD
file isn't giving correct information for duplex printing (which
doesn't entirely surprise me; a lot of printers require a wider margin
for the first side because the printer has to retain enough of the
paper in the mechanism to pull it back in for the back side).  So it
really is a driver problem, I think.


Most likely.

The mozillazine.org site has a database of (perhaps most of) those entries in about:config. For the "print.print_unwriteable_margin" entries, it indicates the default setting is -1, which will use the system default. I changed all four of the entries to -1 and printed. Headers and footers printed on both sides. In looking as to where they printed with -1, it seems that 56 for bottom and 25 for top, left and right are pretty close to the system default.


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