Last time I restarted Firefox, I had over 350 tabs open. Which is ridiculous, of course, because I'm sure that I haven't looked at more than 100 of them today, but since that all fits into 1.2GB of memory (currently), what's the problem.
(To add to the description, from their github readme)
> "The Great Suspender" is a free and open-source Google Chrome extension for people who find that chrome is consuming too much system resource or suffer from frequent chrome crashing. Once installed and enabled, this extension will automatically suspend tabs that have not been used for a while, freeing up memory and cpu that the tab was consuming.
Chrome's session restore silently loses tabs when you have a lot open. It is completely unreliable in my experience. Sometimes a window will come back with half the tabs missing, which is obvious, but when it's only a couple missing, it's much harder to even know.
Also, Session Buddy lets you export sessions to back them up and move them between computers, etc.