Only the options for not logged in show up in the dropdown menu after clicking my avatar on the top right. I can't subscribe to any youtube channels. Sometimes the menu on the left looks like if i was logged out. It started doing that maybe 2 days ago. I uninstalled all addons, cleared cookies and cache, reinstalled the browser but it did not work. It works fine in chrome, i just prefer mozilla. (random channel i could recreate it in)