will it save session to do browser upgrade?

was needing some help here. last time i updated my ff version, which i have'nt done in a long time and needs to be for certain things to work. reason i have not is i have a few windows open with several tabs each on diff subjects, which i have not read yet. last time i did a browser update i lost my session and the history too. is there a way to ensure i can save my session so i can update the browser. and explain in steps for me. i actually have medical condition affects my cognitive functioning much like MS and Alzheimers combined, mainly memory and concentration, need ram and cpu upgrade, lol i appreciate the help anyone?.