Are you asking about when you next start Firefox?

Type about:preferences#general<enter> in the address bar.

There are two settings;

• When Firefox Starts

When the browser is started, what do you want to display? Many of us choose Show My Home Page.

Hi Masha01, it is not necessary for you to confirm to Firefox that you want to save your session when exiting. By default, Firefox saves your session automatically, and at the next startup, you can use this command:

• menu button > Restore Previous Session
• (menu bar) History > Restore Previous Session

That assumes you do set Firefox to remember history and do not set it to clear history when it closes.