Rated 5 out of 5 stars

To remove header/footer (and add some other settings) open the jar file and find overlay.js. Add these lines

// Mod
printSettings.footerStrCenter = '';
printSettings.footerStrLeft = '';
printSettings.footerStrRight = '';
printSettings.headerStrCenter = '';
printSettings.headerStrLeft = '';
printSettings.headerStrRight = '';
printSettings.printBGColors = true;
printSettings.printBGImages = true;
printSettings.printInColor = true;
printSettings.shrinkToFit = true;
printSettings.paperSizeType = nsIPrintSettings.kPaperSizeDefined;
printSettings.paperSizeUnit = nsIPrintSettings.kPaperSizeMillimeters;
printSettings.paperWidth = 210;
printSettings.paperHeight = 297;
// End Mod

This review is for a previous version of the add-on (0.75).