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Well, it's not infeasible. We don't use localStorage -- we use IndexedDB, which can store gigantic files. But I've never tried stuffing 100+MB into IndexedDB before.

(Sidenote: I'm the author of the BrowserFS library, and helped implement this feature.)

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I think your work is amazing and you should link to it: https://github.com/jvilk/BrowserFS

Keeping a copy of the disk around might actually be a good idea, as that means the browser has to hold on to it. I've found that in practice, Firefox and Chrome never hung onto the disk image in their cache.

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