Note: This is how it works on Windows, not sure if Mac is any different. Then your old session should be back once you start Firefox again. session-storage is robust, but not too much and the resulting jsonlz4 might be nested ( leaving about:sessionrestore open in another restored session) yielding monster jsonlz4 ( 80 Mbyte jsonlz4 is 300Mbyte ). Then close the browser, and replace the "sessionstore.jsonlz4" file that's in the root of your profile folder (so not the same sessionstore-backups folder, but the one where it's in) with the file that you just renamed. What you'll want to do is take the previously mentioned session file and rename it to "sessionstore.jsonlz4". What is the difference in the types and how do i recover from the. (And it's a good idea to back them up every now and then, if your tabs are important to you.) jsonlz4 viewer Jsonlz4 JSON backups in the bookmarkbackups folder Once those older. It's a good idea to make backups of all the files in the folder at this point. When Firefox crashes, sometimes it does not open the previous session, even when correctly copying the session backup to sessionstore.jsonlz4. If you did restart your browser, or something else happened to the file, there should be a backup from the last time you updated your browser called upgrade.jsonlz4. I then renamed the previous.jsonlz4 file to recovery. previous.jsonlz4 should have your previous session, if you didn't restart your browser again. I went in to sessionstore-backups in my user folder and created a back up of the whole thing. In your profile folder, go to sessionstore-backups, and there should be a couple session files. (If you have multiple profiles, it should say "This is the profile in use and it cannot be deleted." on your current one.) If it's not there, then you can go to your profile folder by typing about:profiles in the URL bar, and then pressing "Open Folder" on the one that's next to "Root Directory". Now open the sessionstore-backups folder, copy the most recent 'previous.jsonlz4' to the profile folder and rename it to 'sessionstore.jsonlz4' - replacing any that. Share Improve this answer Follow answered at 16:01 mivk 3,346 29 31 I think lz4json is enough. There are binaries available at the releases page. For Windows (or Linux), there is also mozlz4. First copy and backup 'sessionstore-backups' folder, and also the file 'sessionstore.jsonlz4' in your profile somewhere. lz4jsoncat can unpack lz4json files as generated by Firefoxs bookmark backups and session restore. If you are unfamiliar with how to locate your folder, please see: Profiles - Where Firefox stores your bookmarks, passwords and other user data on Mozilla Support.Check "Recently Closed Windows" as well, just in case. I wrote instructions for restoring tab sessions from backup.
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