While the interface is great, the main reason I got this was to save memory. I'm not sure if this is a Firefox issue or an issue with the extension itself, but the tabs that are stashed still take up memory.
Tab Stash will indeed save you memory, as it will automatically unload stashed tabs that haven't been used in a while. If you'd prefer that stashed tabs are closed completely when they are stashed, this can be changed in Tab Stash's options. Hope this helps!
