Running v150.0.3 on a Windows 10 PC. I have (HAD) 5 windows open with about a dozen tabs in each one. Just realized that one of the windows is gone! Every time I startup Firefox, I always allow it to automatically update the version. I have a bad feeling this missing window issue happened during the most recent update (last week?). Has anyone ever experienced this issue or have any ideas how this could have happened? Any chance of recovering that window? I have weekly backups of the SSD containing all my Mozilla files & folders (Firefox and Thunderbird). Thanks