Yes, that's exactly it, thank you!
I checked another device where I got Fennec installed and it still works just fine there since I don't have automatic updates enabled and it's still on 139.0.4. But by the looks of it it seems to be intentional and I think I vaguely remember either F-Droid or some other place even advertising Fennec with that feature.
I just installed Ironfox to check and I'm running into the same issue there. I'd also be fine with a browser that lets me enable closing all tabs and deleting all history and cache upon closing the browser, private mode was just an all in one solution for that.
Are those too specific demands for a browser for android? I thought these were very basic wishes a user might have...
I essentially fall under lawful neutral but I'm not so sure the maker of this graphic would agree if they found out the monitor's height isn't adjustable so it's standing on the package of a dumbbell set (two weights I never use and the instructions should still be in there). The laptop is placed on an incomplete ikea bathroom mirror cabinet shelf add-on that I basically used once and realized I didn't actually need it so it's been in misuse ever since I bought it basically. The bathroom shelf is only half as deep as the laptop so I've added a pad of mixed media art paper on top of it/below the laptop for stability.