Possible bug in Plasma 5.8.7 System settings

[lloyd]

So here's the problem...I cannot get links sent in e-mails. to open properly. The links seem to open (I'm using Firefox 52.2 ESR) but ONLY if preceded by http:// or https://. Links without htt* don't open. So under Plasma 5.8.7 system settings, I click "Applications" and then "Default Programs." (default program for http(s):// is Firefox.) So when I click on "apply", it just greys out and stays that way. So I don't think it accepts the changes. Changing to Chromium-browser instead of Firefox made no difference.
Any ideas?
Thank you!

Lloyd

[doktor5000]

Well, basically if a link does not include the protocol then it's incomplete. Also many email clients will try to auto-convert stuff like www.domain.org to clickable hyperlinks.
See https://en.wikipedia.org/wiki/URL - your link only seems to consist of the authority section, but the scheme is missing.
But that depends on the email client used and the actual details of the link you're talking about, this does not have anything to do with plasma itself.

So what email client do you use, and what is the actual link, please provide an example. Please also provide the actual source code for that link from the email (and not only the plaintext representation you see in your mail client).