Hello iLAORI,

Would you do this please :

Type in the address bar about:config and press Enter (promise to be careful, if asked)

Type in the search bar and look for the preference :

browser.tabs.closeWindowWithLastTab

and set its value to false (default = true)

Then close and restart Firefox.

Now when you close the last tab, Firefox main window will remain open.

Thank you.

iLAORE said

Thank you.

My pleasure !