More like 40. I usually try to run < 10, but sometimes it gets out of hand...I tend to have multiple "tasks" of research going on at the same time. Like if I start researching at home at night I'll sometimes leave it open through a whole workday until I can return to it at night. Then multiple things at work, etc. So yeah...probably my browsing habits that may need to change.
You should try the Tree Style Tabs add-on for Firefox. You may need to tweak some of the settings a bit, but once you experience the power of this extension I guarantee you really won’t ever go back to Chrome.