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I just read through the issue and then went to cyph.im to take a look myself. It fails in my Firefox because of a HPKP problem, so it seems like I accidentally deleted the cached version (or it was cleaned up automatically?). How would you solve that issue for your use case?

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Sorry, yeah, that is a known issue in Firefox that we're trying to have resolved; it apparently cleans up ServiceWorkers/AppCaches that haven't been actively used recently. Was this your first time opening cyph.im, or had you used it in the past?

I have used it in the past, that's why I assumed my cached version was cleared.

Ah, cool, that makes more sense (I couldn't think of a reason for that to possibly happen on the first use, since at that point the pinned TLS key wouldn't yet have been invalidated).

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