@ruffni@mstdn.io

Something to test: if you go there using a different browser, are you still logged in then?

If not, then there is something firefox-related that you did not manage to remove. You could search in the .mozilla directory or something to try to figure it out.

If you are logged in even when using a different browser, a browser from which you have never logged in, then they do something else, something not related to the browser.