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After tabs gone, how to restore session in Firefox on Lubuntu 16.04?

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I'm on Lubuntu 16.04. Opened Firefox. Blank window, all my 10+ windows and many tabs were gone. I only have one firefox profile. I start looking up info, I find my profile directory and copy my sessionstore-backups directory. Use some nice dude's tool at https://www.jeffersonscher.com/ffu/scrounger.html to verify the old previous.jsonlz4 has my windows and tabs, and it does.

However, there is NO sessionstore.jsonlz4 in my main profile folder, only a bunch of files, which include sessionCheckpoints.json, the only file with any "session" in the filename. If I copy my previous.jsonlz4 to that directory (yes, using sudo) as sessionstore.jsonlz4 and run Firefox, it's blank as before, with none of the old tabs or windows. My suspicion at this point is that Firefox 68 on Ubuntu is doing something different than Windows, but I really have no idea. How do the sessions work on Ubuntu, what is the sessionstore.jsonlz4 equivalent?

I'm on Lubuntu 16.04. Opened Firefox. Blank window, all my 10+ windows and many tabs were gone. I only have one firefox profile. I start looking up info, I find my profile directory and copy my sessionstore-backups directory. Use some nice dude's tool at https://www.jeffersonscher.com/ffu/scrounger.html to verify the old previous.jsonlz4 has my windows and tabs, and it does. However, there is NO sessionstore.jsonlz4 in my main profile folder, only a bunch of files, which include sessionCheckpoints.json, the only file with any "session" in the filename. If I copy my previous.jsonlz4 to that directory (yes, using sudo) as sessionstore.jsonlz4 and run Firefox, it's blank as before, with none of the old tabs or windows. My suspicion at this point is that Firefox 68 on Ubuntu is doing something different than Windows, but I really have no idea. How do the sessions work on Ubuntu, what is the sessionstore.jsonlz4 equivalent?

Chosen solution

Nevermind, it's one of "those days." All my windows loaded in a desktop I normally don't use, and they were all minimized so I didn't see them. I was opening Firefox in my normal desktop, so that window was blank, and of course the sessionstore.jsonlz4 wasn't there in the directory because Firefox was actually open.

An idiotic cautionary tale, perhaps.

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Nevermind, it's one of "those days." All my windows loaded in a desktop I normally don't use, and they were all minimized so I didn't see them. I was opening Firefox in my normal desktop, so that window was blank, and of course the sessionstore.jsonlz4 wasn't there in the directory because Firefox was actually open.

An idiotic cautionary tale, perhaps.