While it is not serious (in this site), it can be annoying to see that warning each time.
Here's how you can disable that warning in Mozilla:
https://support.mozilla.org/en-US/questions/1176926
Quote:
To Remove the Warning Panels
(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 insec and pause while the list is filtered
(3) Double-click the security.insecure_field_warning.contextual.enabled preference to switch the value from true to false
(4) Assume this login could be easily stolen and avoid re-using it on important sites
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It just disables the warning.
Doesn't mean the security certiificate has been updated.
So be careful when loging in to other sites and use all the usual precautions with your passwords.