Firefox lost all my tabs

Question

I had firefox open twice and accidently closed one, leaving one open. Then I closed the other. The first had 22 tabs open, the second just one. When I opened firefox again it only remembered the last window I closed, the one with just one tab open. This has happened once before and it remebered the window with one tab open, but I just closed it and opened it again and it remembered the window with multiple tabs open. This time, though it will not remember the 22 tabs and I ve tried closing it and re opening several times, but my 22 tabs dont re-appear. I ve tried contacting Mozilla and there is no way of doing so, unless I want to fly to the US and knock on their door, as their address is the only contact details they give. I really need those 22 tabs open again as I cant remember them all ! Some tabs have only been open a few days, some for months so a simple check in history wont help.

Answer 1

garferi, thanks for the pointer about File -> Exit. However, I find it a clumsy solution: no one is using File -> Exit if there is a closing button. No one will ever know this crucial difference between the commands unless they do specific investigation. There is no keyboard short-cut for that File -> Exit command either, even as the Mozilla folk are advising to use it.
Consider this. I have opened a lot of tabs. I have created several tab groups, and I have opened a lot of tabs in each of them. I open Firefox, do stuff, close Firefox numerous times. Then once I get a pop-under window that I miss. It's easy - they are designed to be missed. I want to exit Firefox, so I click on the close button. I am now left with the pop-under window. I close that one too, and upon the next Firefox start all my tabs in all my tab groups are lost.