Remember to use ad blockers and DNS filters ladies and gentlemen!
Have no idea what Otto[.]de is, nor do I have any plans to find out. But god damn thats a long as time. Its the equivalent of 9993 years if anyone was wondering...
Source; Cookie of a sketchy free VPN that I'm investigating.
If you don't have your browser set to delete all cookies you haven't made exceptions for, every time you close it, I don't know what to tell you. Except... "you should do that".
I use Firefox temporary containers. So not only are they deleted 5 mins after I close a tab, but different tabs don't share cookies unless I explicitly allow it or the tabs are opened from one source (e.g. open link in new tab)
It does not seem available on mobile. On desktop, it is an extension called "Temporary Containers". You may also want the official "Firefox Multi-Account Containers" for managing sites where you want to stay logged in.
Privacy. By using containers and deleting cookies frequently, you can minimize the amount of tracking and data collecting these scum sucking corpos are doing.