I'm in the U.S. and didn't have the Win 10 notice either. Today, I uninstalled KB3035583 on my Windows 7 partition, rebooted and reinstalled KB3035583 through Windows update. That did the trick for...

I had no problems with Thunderbird in Build 9841. Since update to Build 9860, all printouts of email messages come out blank. I have no problem printing with other programs.