After about an hour or so, I see my Windows 10 taskbar 'refresh' - the icons of the taskbar 'blink', i.e. disappear and then about 1/4 second later reappear. When this happens Firefox logs me out of all open (or closed) web pages that require me to log in. So I have to relog-in to my Google, my Frenchpod101.com, Germanpod101.com etc. accounts, whether or not those sites are open or closed on the browser at the time of this 'refresh'. I don't know this is another symptom of the latest Windows 10 update (these updates always seem to cause issues), but my other browsers - Chrome and Edge - are unaffected by this 'refresh'; those browsers keep me logged in. Only Firefox logs me out. After logging back in, the Windows 10 taskbar 'refresh' occurs again an hour or so later and I'm logged back out of all my websites again - rinse and repeate. Please note that Firefox is still open when it logs me out. I stress this because all similar problems other people have had with Firefox logging them out of websites have occurred as a result of the browser being closed and then re-opened; then people find out they've got to log back into their websites. That's not happening here: my logging-off problem with Firefox occurs when the browser is still open. PS I didn't get a confirmation this question was successfully posted, so I'm sending it in a second time - sorry if it gets duplicated.