Discussion - Set Aside Tabs and Warn on Close

I'm using Firefox and it ALWAYS warns me if I want exit with more than a tab opened ! And it's optional !
I exit a lot by mistake and this warning always saves the day!
I use more than 20 tabs and sometimes even more than 200 tabs in the same time daily for my work!!!
Now Imagine if I clicked exit by mistake!! Which happens a lot BTW !!
SPECIALLY when I'm editing in WordPress or editing anything else!!!
So closing all that by a mistake is just A JOKE!! Every browser should have this option! Can't believe many bowers doesn't have it !!
Actually if you don't want to add the 2 options (warn me or don't warn me) for any reason then IT MUST warn us by default then !!!
And it's actually how I count how many opened tabs !! I mean when you add the warning of course you should mention how many tabs are opened in the warning !!

It's just extremely important that I simply won't move to Edge until this is added !!