You may have corrupt sessionstore file(s).

Type about:support in the address bar and press enter.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the sessionstore file(s).. Then rename or delete it. Restart Firefox.

I don't have sessionstore* file(s) just

• sessionCheckpoints.json
• sessionstore-backups folder

Deleting this folder could help?

Thanks

Remove the sessionstore-backups folder.

Doesn't work

Make sure you do not close open windows, but close the Firefox application (Firefox > Quit) while the window(s) are still open. Otherwise you won't be able to reopen tabs automatically and have to use History > Recently Closed Tabs/Windows.

cor-el said

Make sure you do not close open windows, but close the Firefox application (Firefox > Quit) while the window(s) are still open. Otherwise you won't be able to reopen tabs automatically and have to use History > Recently Closed Tabs/Windows.

Thank you cor-el, it works, you save my life :)

But Recently closed tabs is disable (I don't know why)

Have a nice day