Hi! Since WebStorage has been discontinued wouldn't be better to adjust the "save" function to work with Local Storage? I have no idea about how much it would cost for the developers, it's just a suggestion.
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I'm pretty sure this is already the case ("Save" relies on local storage, not webstorage) since, as you mention, webstorage support has been dropped some time ago already.
You can check this tutorial that only mentions local storage as an alternative to the "save" system action.
Thank you, Kyatric! I thought that the "save" function was using webstorage, my bad haha.