How to keep Firefox sessions

I just ran CCleaner for the first time in awhile, and rather than simply having the program delete whatever it found I decided to take a closer look at what was going to be deleted. I wanted to save some of the cookies and found how to do that in the documentation; however, I do *not* want my browser sessions deleted. I tried a right-click to see if it would offer an exclusion, but no luck there.

Can someone help me with finding the proper setting or even command line prompt that would leave my sessions intact? I always want my browsers to start with the last tabs open.

Thanks for your help.

Try unticking/disabling this in CCleaner and see if it works:

Cleaner (broom image/button) > Applications (tab) > Firefox: Session

Thanks so much for showing me where to find that. I don't know why I could find that when searching the help file. Exactly what I needed and allowed me to revise some other settings also.