Far fewer on browsers I use for productive pursuits, but hundreds across multiple windows and many tab groups. I have a lot of projects, and haven’t found a great way ‘shelve’ and ‘unshelve’ them.
About 20-50 open on the personal laptop at a given moment, bursting higher when researching or troubleshooting something. Work computer has more like 75 as baseline, bursting to a couple hundred. Every now and then I very briefly get that back below 20.
(Stretch ask: including favicons.)
Bookmarks require organizing them; folders worth involve waiting for them to open. Also, both bookmarks and following links to reopen things require using the mouse if you don’t want to use incredibly slow, clunky accessibility UIs, and I aim to mouse as little as possible. Context switching is hard enough without having to locate your bookmarks and wait for all the pages to load.
At work I’ve typically got a half dozen ephemeral pull requests (mine and teammates) on both comment and diff view, GitHub actions in flight, a handful of frequently-referred dashboards, a dozen tabs for various AWS services and logs, another 1-2 dozen tabs each for APIs I’m integrating in some of said PRs, plus the relevant admin panels for those third party services; issue tracker with several tabs for projects and tickets in flight or upcoming or being written/fleshed out; internal documentation I’m writing or reading; and then a couple dozen for whatever other topic I’m researching at the moment.
That gets me through a typical day with a couple meetings; a bunch of PR review and revisions; a bug or data question investigation or two; and a few hours of good deep focus work.