A few days ago, Chromium started to report Flickr's certificate as problematic:
The server presented a certificate that was not publicly disclosed using the Certificate Transparency policy. This is a requirement for some certificates, to ensure that they are trustworthy and protect against attackers.
There are issues with the site's certificate chain (net::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED).
Since the problem persisted since then, I tried to open the website in other browsers, and to my surprise, on the same machine, both Firefox and Google Chrome open the HTTPS version of this site successfully.
What does this imply in terms of security? Is someone doing nasty things to me? In other words, could it be that the certificates used by Chromium were changed by a virus? If yes, what's the point?