> > If yes, how and when are they generated? > The capability exists in the format and in each Mozilla client. All clients will behave correctly if a per-collection key is introduced. Only an add-on would introduce one (outside of tests) — by default only a default key is used by Firefox.
> Should a client always check if the per-collection key bundle exists > when encrypting/decrypting records? Or is it safe to directly use the > default key bundle like here [1], [2]? > 99% of the time you should be fine to do so, but you should be aware that you might fail at some point.
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