[errnoh]

2333 tabs open (Firefox 75.0), split between three windows atm. Using ~3GB, about 50/50 split between main process and plugin-containers.

There's no clear reason for page to be on any specific window though. Usually I just end up with 15 pages open next to each other about some specific topic that I'm interested at that time.

Running quite minimal amount of add-ons. Tab Stats is one I'd recommend for people with large amount of tabs. Provides easy way to prune duplicates etc.