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This is not an issue in either Opera or Firefox. The title should probably reflect that it's limited to Chrome (and possibly other Webkit browsers + IE?).

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Why is not an issue in Opera and Firefox? Do they have smaller maximum caches? Or do they notify you of the background transfers?

I don't think either notifies you about the background transfers, but e.g. Operas default cache limit for Application Cache is ~50 MB according to http://www.opera.com/support/usingopera/operaini/.

the default local storage limit for Firefox is 5 megs per domain.

Sorry for nitpicking, but I think local storage is a part of Web Storage (http://dev.w3.org/html5/webstorage/), and not Application Cache (http://www.whatwg.org/specs/web-apps/current-work/multipage/... or http://dev.w3.org/html5/spec/offline.html).

I think that the Application Cache quota is not strictly connected to the local storage and session storage limits.

That's correct. Chromium has talked about unifying all these kinds of storage under one quota system, but it's not done yet.

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