Comment by bubblethink

Related: Google also tightened the link between gmail and youtube. Logging into gmail logs you into youtube too (which is quite pointless at least for me). This had been the case for a while, but earlier it was possible to manually delete youtube cookies, which would log you out of yt but keep you logged into gmail. They removed this workaround a few months ago. My solution to this was to use chrome only for gmail, and use chromium for everything else. This is poor-man's isolation, for what should be a browser feature (like firefox containers). Also, extensions like cookie-auto-delete don't work nearly as well on chrome as they do on firefox due to long standing bugs in chromium that are likely not getting resolved any time soon. More reason to switch to firefox eventually.