User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 Build ID: 20170323105023 Steps to reproduce: Thunderbird update from version 48 to version 52. On Windows 10. Printing an e-mail results in the output of a large number of white pages Actual results: Search in Thunderbird Help and applied the following configuration change already reported in Firefox 47: Printer Settings: Assign print_paper_height and print_paper_width to -1. Bug corrected! I can print my mails.