Firefox has no preferences or controls for something like that, it's a function of the print drivers / software.

When you initiate printing the "native print dialog box" appears, make sure the correct printer is selected, and then hit the Properties button. Select the odd / even pages on the Page Layout tab in your Printer Properties dialog box. Different brands of printers categorize that option differently, some may have it as "2-sided printing" - which works if you want the odd-numbered pages (just cancel printing at the point you are prompted to turn the stack of printed pages over and to insert that stack onto the feed tray), but it probably won't work for even numbered pages. The options available on your printer are probably going to depend on the price level of the printer you have; I buy cheap-ish printers which aren't very sophisticated with options.

I do not agree with you. In a lot of other programs including other web browsers (including IE and Chrome) the print dialogue that shows up gives that option independently of the printer. For the page range instead of just giving the option of start and end pages it gives you the option to choose exactly which pages to print. I would use the other browsers except they mess up a different part of the print process. I'm using this to print shipping labels so that is why I am so picky. It prints an extra disclaimer page for each label and I don't want to waste all those labels.

I forgot to mention that I included a screenshot of Firefox Print Dialogue and Chrome Print Dialogue.

"Good" comparison in your screen shots. In Firefox you show a Brother QL line label printer (I do retail support for Brother) and for Chrome you show a $750 Xerox Phaser; you're "stacking the deck" to disagree with me. That's like comparing a Yugo to a Ferrari as far as features and power.

Bottom line, Firefox's print modules date to the early days of Netscape and most are probably 10 to 12 years old, or maybe as much as 15; whereas Chrome is a much more modern browser.

Use whatever does the job for you.