I always shut down my PC (Windows 11) while Firefox is open, and it reopens automatically when I turn it back on. However, the settings and the layout are reset. I tried closing the browser normally via the Close button, but the issue persists. I tried killing the process via Task Manager, but the issue persists. I'm not opted into Firefox Studies. I use quite a few extensions and also Container Tabs. I tried disabling all extensions, but the issue persists. I just can't disable Container Tabs to test because I would lose too many tabs. Could Container Tabs be the issue?