I don't have 400, but I do have 200+, spread across three windows. I use Chrome's profile feature, to have separate Google accounts signed in. And my tabs ten

I don't have 400, but I do have 200+, spread across three windows. I use Chrome's profile feature, to have separate Google accounts signed in. And my tabs tend to be in "clusters". E.g. I'll have one cluster (5-10 tabs) where I'm doing research on IPv6, another where I'll have a cluster on some JS, another on say, Python list performance etc. I remember where each cluster is, and even some of the tabs within each cluster - so I just page quickly to that cluster if I know I need to retrieve that info. Also, I tend to not be that disciplined when bookmarking or filing stuff - so there's that as well. I'm still yet to find a good lightweight note-taking system - Confluence as a wiki isn't bad, but is still quite heavyweight.