When printing the same page repeatedly, FF gets increasingly slower and slower each time until it is downright ridiculously slow and takes up to a minute, perhaps more, to get to the print menu. However, if you reload the page, printing is instantaneous (at least for the first or second time). Some history or memory management problems? FF Version 135.0 (64-bit) on MacBook Pro Sequoia 15.3.1 One test case would be https://api.razzlepuzzles.com/cryptogram. Keep selecting New Game from the pull-down menu on the right and try printing as PDF (or anything else).