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It is strange because, for me,  I take the file and put it on a window of safari  , then I keep it in the favorites.

I play it without problem, and when I want to quit (to keep the position) I go to the menu and then I can go to another page of the web or quit safari.

When I come back to the game a day after I click the favorite submachine, and I retrieve the last position.

But your solution must also be ok... ;)