Depends. I let the number grow until it's on the order of a few thousand usually (enough to where it's bogging down browser performance) and then I make it a po

Depends. I let the number grow until it's on the order of a few thousand usually (enough to where it's bogging down browser performance) and then I make it a point to explicitly save a Freshstart session and then kill all my browser windows and start over. Right now I have 336 tabs open across 19 windows.