Yeah, I need to be more diligent about this if I am going to continue using Tabs Outliner. I do use TO to unload tabs - the ~30 tabs I have open are probably only 10% of the tabs contained in TO.
I think I'm going to stick with Chrome. Once we figured out my lockup issue is Chrome related, I installed the latest version of Firefox, and even with 3 tabs, FF seems more sluggish than Chrome with 30 tabs.
Plus I just learned a bit more about Chrome and its multiple processes:
Why do I see multiple chrome.exe processes in the Task Manager?
Chrome has its own process manager (who knew? lol), so it gives me a way to kill off the most resource hogging Chrome processes when I detect a lockup coming on. The saving grace of these lockups is their gradual nature - the slowing responsiveness acts as a warning, giving me time to unload tabs, and kill processes.