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Yes, in those links, the color of the text is changed and it is this color change which indicates it is a link, not underlines.
This is the correct and expected behavior for links in texts, to use color instead of underlines and to change to a new color (and/or add an underline) when there is a mouseover the link. This is standard best practice for links in text these days.
Do you want to change the color of the link indicator color (in post text) to make it stand out more?
My old eyes didn't see any color difference between the text in a link and text that is not in a link in either FireFox or Safari on macOS High Sierra (version 10.13.6) on a 2 year old or 4 year old MacBook Pro.
Now that you tell me there is a difference, I can see that the link text is a very slightly lighter black if I blow up the text to at least five times its normal size.
So, yes, I very much want to change the color of the link indicator color to make it stand out more!
Sorry for the confusion. My sight isn't as good as it used to be.