Thanks for feedback and for the nice review even though you seem to have some issues.
I'm not really sure what could be the problem in your case. I think that I quite failed to explain how the auto-saving functionality is implemented and that might create the confusion that saving is not happening. First of all: auto-saving will rewrite the same saving slot and not create a new one each 300 seconds (or whatever time you set). So after 20 minutes, you won't have 4 saving slots but actually the same one updated withing the last 5 minutes. A saving slot is actually created only you open the browser. (If you close the browser and the open it again you will find the previous session saved there and a new one called Current Session which will be used for all the saves from when you restarted the browser) As I don't really use the auto-saving feature that much (I actually disable it for myself) I probably fail to understand how it may be perceived by other user. The way I implemented felt right for me but I've seen some addons that actually keep a copy for each save point so I assume that the behavior I implemented might be unusual or not that useful for some people. I will try to provide some options to configure the auto-saving just the way each user expects it...
I'll try to provide an improved auto-saving experience (as well as better documentation) as soon as possible within the update. Thanks again.