I already set it in the KDE configure your desktop -> Workspace Appearance -> Default Applications and it still comes up as though it isn't default. I don't really know that it isn't other than it says every time that I open it that it wants to be set as default. Thunderbird links don't open at all, but that is for another thread and a minor issue (just haven't had time to tackle that yet).
Ok, I just tested it, I put a link down in a note, and the clicked it and it opens in Chromium, the odd thing is that Chromium thinks it isn't the default app. Very odd? When I go to preferences in Chromium it says it isn't set as default. Is this a Chromium bug?