FIREFOX BLOCKED PAGES I KNOW ARE OK

Yes, ui-deref.com got blocked in the past day or so, probably for containing malware.

If you're okay with taking the risk and the destination link (in the /r/?to= parameter) sounds alright, you can click through the dialog's warning and continue anyways, there's link inside the details for that.

I have an email account at mail.com. It seems all links are going to www.ui-deref dot com and are blocked by "Google Safe Browsing". I don't know what "Google Safe Browsing" is? I also don't know what lurks at ui-deref dot com, so I don't want to approach either of these.

Clicking on your support email to confirm subscription to this thread also gets blocked by "Google Safe Browsing" as going to/linking to ui-deref dot com. See attached image.

If neither are a Firefox problem, I assume it is at mail.com and I will try them for an answer as well.

Thanks! Chris

Yes, seems to be a Mail.com issue from all the reports — they apparently started rotating the domains they use to isolate the outgoing content and some users started to see links working again after they triggered via a different domain — so they're already trying to replace these for users.

I've run into this too. Sometimes Firefox blocks websites that I know are perfectly safe, which can be pretty frustrating. In many cases it's caused by Firefox's security features being a bit overcautious, or by antivirus software flagging the site incorrectly. I'd check the exact warning message first, as that usually points to the real cause. If the site is one you trust, you can also try disabling tracking protection for that specific site or testing it in another browser to see if the issue is Firefox-specific.