I left the tab open and shut down the computer and log on again, but the tabs disappeared, and when I close the tabs at once, the button to restore the previous session comes out as soon as I turn on Firefox. So I tried to try to find out how to restore the previous session, search for it and let Mozilla know how to do it, but it does not fit my Firefox. I'm up-to-date but I do not know if the version is different. This is because there is no version in the explanation. First of all, if you click on the menu, you can not see the tab for restoring the previous session. Also, when the session is restored, there is no match for my case, and there is no last window and tab view when launching Firefox in the General panel in Settings. Once I have found all the fixes in my Firefox configuration, I have checked the old panel under the start page in the General panel, and I left it in my history. Cookies and site data are also available until the expiration date. No, it was already there. But the tabs disappeared. As a result of my thought, I deleted the entire visit record in the morning. I've kept tabs on Firefox ever since. But I do not think it would be a problem if I deleted my records. This is because the closed tabs are recorded as soon as the tabs are closed even if the history is deleted. I've looked into the add-on to see if there are apps that revert closed tabs, but nothing I thought of. What I'm saying is that Mozilla support is different from the latest version of Firefox. Therefore, other users are uncomfortable and uncomfortable. Also, I want to know why the closed tabs did not reopen as I said so far. And how do I know if I can revert closed tabs back to normal? I have a long question, but please answer it in detail. I do not know how to speak English. There may be awkward sentences, but I hope you understand. request.