In FF 46.0.1, there is a preference that might help, if you have the same preference options. Go to Firefox > Preference > General and look at When Firefox Starts. If you set that to either show your home page (assuming that it's not the one that causes the problem) or show a blank page, that should do it. One of the options in my version is to do exactly what you don't want, namely show windows and tabs from the previous session.


Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365