Improves on the technique used in r65391 to fix the font-size issues in Firefox,...

Improves on the technique used in r65391 to fix the font-size issues in Firefox, Chrome and Safari caused by using "monospace" as a font-family. The old approach was to use "monospace, sans-serif", which worked but was reported to actually fall-back on the sans-serif variant. Some research has shown that using '"Courier New", monospace' resolves the issue on all browsers without risking falling back to proportionally spaced fonts.