Hello Briankarens,

Would you please type in the address bar about:support (press Enter) => Profile Folder => Open Folder Then check if you have a user.js file in your Firefox profile folder that sets the value of the browser.sessionstore.resume_session_once preference to "true" (default value is "false") (you'll have to close Firefox first)

See this article : https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save

Scroll down to the section "User.js file overriding Firefox settings "

Thanks for solution. Wouldn't it make sense if FireFox preferences listing INCLUDED any settings from user.js?

Briankarens said

Thanks for solution. Wouldn't it make sense if FireFox preferences listing INCLUDED any settings from user.js?

Maybe you'd like to submit feedback, using this link :

https://qsurvey.mozilla.com/s3/FirefoxInput/

Worth a try ....

Hi, I am having this problem too. Firefox 74.0 on openSUSE Leap 42.3 - KDE Plasma 5.8.7. In the preferences I have "Restore previous session" unchecked. in about:config I have:

 browser.sessionstore.resume_from_crash        false
 browser.sessionstore.max_resumed_crashes  0

I log out of KDE without closing firefox. At the next login all my tabs and windows are restored. I would like to start with a new session with the option of restoring the old session using the menu. I want to keep my history and the undo close tab/window functionality. Is there a way to do this ?

Oh and I don't have a user.js

leishman said

Oh and I don't have a user.js

Hello leishman,

Would you be so kind as to start a new thread, using this link :

https://support.mozilla.org/en-US/questions/new/desktop/other

(you'll have to scroll down to the bottom of the page)

Your problem may be different from the OPs.