Why is my hyperlink in red?
If the background of links is red then that is probably caused by an extension like SEO or SearchStatus that has the option set to highlight noFollow links. You can check the options of such an extension.
Should hyperlinks always be blue?
Shades of blue provide the strongest signal for links, but other colors work almost as well. As always, when using color to signal information, you should provide redundant cues for color-blind users. Making unvisited links brighter and more luminous than visited links will usually accomplish this goal.
How do you hyperlink text color?
By default, a link will appear like this (in all browsers): An unvisited link is underlined and blue. A visited link is underlined and purple. An active link is underlined and red.