I do this. I use sidebery which creates snapshots of all open tabs. I usually have between 100 and ~600 tabs open. Once a month I go through the list and close

I do this. I use sidebery which creates snapshots of all open tabs. I usually have between 100 and ~600 tabs open. Once a month I go through the list and close those that are not relevant anymore (can easily select and close multiple tabs in sidebery). It works pretty well for me, it often reminds me of things I was working on but haven't yet finished. Since I have so many tabs, I also created a firefox extension to pin tabs on the right, so that they are close to the "new tab" button.