I sure don’t understand all the issues, but found the thread at REMOVE Comodo Certificates from FireFox, Opera!!! - Security | DSLReports Forums quite alarming. Is there something to do in CIS if we can’t always trust SSL cerificates? I use Mozilla Firefox.
Welcome to the forums…
I don’t understand all the issues fully myself either, but from what I do understand is that this is not so much as a Comodo’s SSL certificate thing… but anybody’s certificates. He’s another, more famous, incident. It’s something to do with the way SSL certificates are sold by the agents, I suspect their current codes of conduct and procedures could possibly do with some improvement. 
For web browsing SSL certificates? No. CIS only deals with signed files. Different certificates. SSL certificates on web sites are a browser issue.
OK; thank you. I followed their instructions and set up warnings to be extra careful whenever a Comodo SSL certificate is used. Maybe it will be fixed soon.