When creating a new topic, links pasted into the working draft box sometimes generate images; for example:
is automatically converted into
I notice that occasionally the accompanying images are served over HTTP rather than HTTPS, as in the case of placing a link to another post here in the forums; one example:
automatically converts to
which includes the up/down arrow image, served over HTTP.
This of course produces the warning in Firefox shown here
indicating TLS/SSL security is undermined (green padlock next to the URL changes to a yellow caution triangle) because "some elements on this page are not secure".
Truthfully I don't know if TLS/SSL is seriously threatened by such a thing, but as a noob I tend to pay attention to my browser's warnings with perhaps more seriousness than they really warrant. And maybe this is intended behavior for the site, to pull image data over HTTP where necessary, since it doesn't pose any real threat. Just thought I would point out this is happening in some instances.