I need to decompress firefox 57+ opened tabs file.

I use unlz4 from the Ubuntu package liblz4-tool :

$ cp .mozilla/firefox/t6bznle5.default/sessionstore-backups/recovery.jsonlz4 ~/recovery.lz4
$ unlz4 recovery.lz4
Decoding file recovery
Error 44 : Unrecognized header : file cannot be decoded
$ echo $?
  • 3
    Long story short: jsonlz4 is not quite lz4. This decompressor should help you extract the file contents. – undercat Aug 28 '18 at 15:26

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