OCSP stands for Online Certificate Status Protocol. It’s basically a protocol that’s used to make sure that an SSL certificate is still valid and hasn’t been revoked.
Firefox appears to be the only browser that does an additional security check for OCSP and also does a hard fail. This is a security feature of Firefox.
If your SSL report is fail the OCSP stapling, then the site will unable to access by Mozilla Firefox. This is the message from Mozilla FireFox
How to get the SSL report, you can always use the SSL report tools
You could try disabling stapling support from Mozilla FireFox
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.
(2) In the search box above the list, type or paste ocsp and pause while the list is filtered
(3) Double-click the security.ssl.enable_ocsp_stapling preference to switch the value from true to false