Do all other major CAs offer OCSP? Are all major browsers performing the check? I vaguely remember Firefox doesn't. Not at my desk now to check it...

Edit: I believe OCSP is tried, but silently ignored if there is no reponse quickly enough.

Firefox has a a toggle `Query OCSP responder servers to confirm the current validity of certificates`, which is turned off by default.

Edit: It seems to be enabled by default! I've been using Firefox for as long as I remember, and don't setup Firefox afresh frequently.

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