Once upon a time, selecting this option would cause all of my previous tabs to be reloaded once I started Firefox. I was happy. Later, this stopped working. Whenever I would start Firefox, the previous tabs would be displayed, but they would not refresh. Being the type that regularly will leave ten to twenty tabs open all the time, manually refreshing each came to annoy me. Fortunately, changing the value of "browser.cache.check_doc_frequency" fixed this. For a time. Again, my problem returned. Frustrated to open my browser and be shown news from two days ago rather than today, I again went looking for a solution. To my dismay, I only managed to find one way out of my problem, and it seemed to be rather drastic. I disabled the disk cache entirely, and for a time, things were good. But recently things have reverted once more. When my "windows and tabs from last time" are shown, they are always old and require a manual refresh. Perhaps this is desired behavior for some, but for me it is just extra work. The best solution that I have come up with this time is to bookmark all open tabs every time I want to close firefox and then to open that bookmark folder each time that I close it. This seem unnecessary, but I have reached the limit of what I can solve. I would appreciate if anyone can suggest a configuration setting or an extension that can provide the behavior that I am looking for. Thank you.