As a Firefox user myself, with the same problem of having hundreds of tabs open all the time, I've noticed a neat little trick to "unload" all the tabs from RAM

As a Firefox user myself, with the same problem of having hundreds of tabs open all the time, I've noticed a neat little trick to "unload" all the tabs from RAM if you need to free some up. Just bring up the menu bar (or hit Alt), then go to File -> Exit, which should close all Firefox windows but save the current tab history. Then, simply restart Firefox, again go back to the menu, then do History -> Restore Previous Session. Besides the few tabs that get auto-loaded (i.e. the ones you were viewing in each window), the remaining tabs should remain un-loaded until you manually re-visit that tab (at which point the page will be redownloaded or loaded from cache into RAM).