I deal by creating multiple windows, ideally one per general topic/use case. This works great with Chromium because you can easily drag multiple tabs between windows to organize things, and the shrinking tab bar encourages you to close things you don't need. Doesn't work so well in Firefox, where you have to manually drag each tab over one by one, doing so is kinda glitchy, and the scrolling tab bar makes it easier to just fill a window with a ton of unrelated tabs.