It's really annoying, I put my phone down for a while without even closing the Firefox app, yet when I get back to it all my private tabs, that I want to keep private for a reason, are gone! I also have Chrome and Yandex browser installed and there's no such issue with them. If Firefox developers insist on keeping such flush feature for ppl with older phones with limited amount and poor RAM management (who are a minority today) , can't you at least make it optional? Choose in the settings whether to autoflush incognito.. Also, on a side note, it would be really nice to add an option in the help submenu to contact developers directly for feature suggestions (like there is in Chrome and others) rather than having to go through a tech support forum and be uncertain whether my feedback will even reach the right ppl.