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I'd like to know if some web developer has decided to use 5 GB of offline storage for their app.

Well, AppCache works just as an offline caching system for webpage assets (html files, images, javascripts, css, etc). So yeah it's technically possible to have a 5 GB offline cache, but the browser will need to download all the data first.

IIRC most (all?) browsers prompt you when usage goes above a certain limit (5MB, I think). Firefox was the only one that asked you before the site saved a single byte.

Aye. Those pesky visitors who block, purge and otherwise mess with my tracking cookies shall finally be profiled and analyzed. Great development indeed.

This could be both good and bad..

I would like to enable the prompt.

about:config → offline-apps.allow_by_default → false