Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Sometimes not all browser windows reopen when restarting Firefox

more options

A few days ago, I restarted Firefox because it was becoming too slow. When the browser reopened, one of the windows I try to keep open was gone. When I went to Recently Closed Windows, it was not there, so I began recreating the missing window. Today I restarted the browser, and when it restarted, the missing window reappeared. I had this same problem with one of the other windows 1 or 2 years ago, and never did recover the missing window. Is there a way to fix this, or keep it from happening again? I normally have 3 windows open, and have 159 tabs for window #1, 377 tabs for window #2, and 310 tabs for window #3. Is it safe to close the window I partially recreated?

A few days ago, I restarted Firefox because it was becoming too slow. When the browser reopened, one of the windows I try to keep open was gone. When I went to Recently Closed Windows, it was not there, so I began recreating the missing window. Today I restarted the browser, and when it restarted, the missing window reappeared. I had this same problem with one of the other windows 1 or 2 years ago, and never did recover the missing window. Is there a way to fix this, or keep it from happening again? I normally have 3 windows open, and have 159 tabs for window #1, 377 tabs for window #2, and 310 tabs for window #3. Is it safe to close the window I partially recreated?

All Replies (1)

more options

Over 800 tabs? I'm amazed that is even possible. But to answer your question, Firefox should not lose a window; even if a window is closed, the last three closed windows still should be re-openable. Since the window came back, I wonder whether there was some glitch that caused the window to be invisible when it was restored?? Since this occurs so infrequently, I don't really have any suggestions except to make backups of your profile folder.