Yahoo has been changing its mail design. Are you trying to print from the "print optimized" view (which opens in a pop-up window or separate tab)? Depending on which version of Yahoo mail you have, this may be on the "More" menu or somewhere else. (Sometimes I get a popup block; in that case, trying again works for me.) More generally... When Firefox produces a blank page printing a selection, this could be because the selection is laid out "off" the page (e.g., to the side or on a later page). The position of the selection on the page depends on how the page was laid out by the site design. Firefox sometimes will isolate the selection at the beginning of the print job, but very often will keep it within the original layout and simply blank the rest of the content. This can be wasteful or even useless. Here are some workarounds: (1) [https://addons.mozilla.org/en-US/firefox/addon/nuke-anything-enhanced/ Nuke Anything Enhanced extension] See: [https://support.mozilla.org/questions/927457#answer-333518 When using print selection in Firefox 12.0, it prints wherever the selection is on the page (on paper) instead of at the top of the page (of paper)]. (2) Use a bookmarklet (snippet of JavaScript saved as a button on your bookmarks toolbar) to isolate the selection for printing. This is the technique I generally use due to force of habit. The details are in [https://support.mozilla.org/en-US/questions/943039#answer-384875 this post]. Any luck?