Thank you. (I will turn it off and then on, but I have to use the daylight while it's still here. Might report back later - T.Y.)
I just found this:
I turned on my notebook this morning to find Private Browsing on and Firefox reset to the default appearance. I can't find out how to turn this browsing feature off! Read the articles, looked at Community forum ... nada. Please help! I want my own Firefox back!
Chosen solution
Firefox 20 has made some major changes in this area. If you are automatically in private browsing mode, it could be related to your history setting.
purple Firefox button (or Tools menu) > Options > Privacy
If you have Firefox will "Never remember history" that could cause this problem. Change to "Use custom settings for history" and uncheck the box for "Always use private browsing mode".
Does that work? You might need to restart Firefox in order to escape, as I don't see a way to change a private window into a regular window.
If you think education is expensive, try ignorance.