Firefox, browser close confirmation?

Question

Mozilla Firefox

Hello!
I've been trying to solve this problem for a long time, but I can't solve it. When FF is set to "save open tabs on exit", it stops asking for confirmation when the browser is closed. It happens that I accidentally close the browser and then have to wait until all the tabs are loaded.
Once upon a time I solved this issue on another PC, but now I can not remember the solution. Whether it was an extension, or a site with JS exit confirmation. Do not offer options "use another browser" and "do not accidentally close the browser" :)

Answer 1

The issue was resolved with the addition of Tab Mix Plus . Now the tabs are saved and when you close the browser, a confirmation of closing is always displayed

Answer 2

Type about:config into the address bar
Find the browser.showQuitWarning parameter there and change it to true .