Firefox "froze" and I closed and reopened using restore previous session. Tabs opened across the top, but they were blank (no words). I closed and opened again, and only one tab opened. In my library profile, there is no recovery.js or sessionstore.js file. There is no sessionstore.bk file. Dated today when the crash happened, I only find previous.jsonlz4, recovery.baklz4, and recovery.jsonlz4 documents. There is also a previous.jsonlz4 document from a few minutes before the crash. Is there any hope of recovering my tabs?