More bookmarks, fewer tabs.
I have, for instance, a bookmark for the linux.org forums login page. When I log in, I see a list of the different forums with those with unread threads in bold. I right click each bolded forum to open it in a new tab. When I move to the tab for a specific forum, there's the list of threads with those with unread messages in bold. On a good day, I might end up with a couple of dozen tabs open. When I move to the tab for a specific thread, I read the new messages then, if there's anything I might want to refer back to later, I bookmark it. Either way, I dismiss the tab and move on. When all the tabs back to the main forum list have been dismissed, I "mark forums read" and log out.
Similar with other sites, of course.
So I have probably three or four hundred bookmarks including various search engines, forums, churches, projects, pages on my local web server, stuff that I want to buy some day, etc, etc etc. But I don't think I've ever had more than thirty or so tabs open at once.
I back up my bookmarks to a .json file whenever I add a new one (in firefox, Bookmarks | Manage Bookmarks | Import and Backup | Backup ) so that I can restore them after restoring ~/.mozilla to a clean state (which I do, for instance, before and after using facebook and such).
One of the reasons I consider a couple of dozen tabs to be "a lot" is that I spent a lot of years using systems with "limited" (by today's standards) amounts of RAM. While my current systems are reasonably well spec'd with RAM, I don't see any reason to waste it. And I occasionally still use a netbook with 1 GB, so I don't want to form bad habits (or at least not -that- bad habit!
). And, to top it all off, I recently had something, with the browser being the prime suspect, bog my system down to the point where I had to power cycle the machine. Whether or not "having too many tabs open" might cause or contribute to that, trying to remember what I was doing in some large number of tabs seems likely to be futile. (and no, neither the RAM usage nor the CPU usage was maxed out.)