Have you done a normal exit/restart of Firefox since this problem started? I ask that because... Many users have lost their connection to Google sites after some period of normal browsing after the Zero Round Trip Resumption feature was enabled a few versions ago. This feature is designed to speed up connections on active tabs, but there seems to be a glitch with Google sites. Here's how to turn off this feature and test whether it's a factor: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''security.tls.enable_0rtt_data''' and pause while the list is filtered (3) Double-click the preference to switch the value from true to false After that, try Google/YouTube again in a new tab. Any improvement?