Hello, I have, for the past few months, always had certain tabs open in FireFox. Have never closed them. FireFox has always, except for one occasion, restored my entire session. In that one instance, "open previous window" worked for me. Just a bit ago I had FireFox opened, and closed it. I then realized I needed to do one more thing so opened it back up. All of my tabs opened to "new tab". Restore previous session is grayed out. These were a lot of tabs, as I said, some open for months that I will not be able to find. There has to be another way to restore the session.