Wikipedia doesn't specify the link and visited link colors -- those are
the browser's default ones, which you can change in Fx via the dialog
JJS posted. Wikipedia does turn off link underlining, which you can
override in a couple of ways.
In the chrome subdirectory of your profile directory, you can create a
userContent.css file to override the styles of web pages as well as the
default styles of the browser. You can use the userContent-example.css
file already there as a template. To get all links underlined by
adding the line
a:link { text-decoration: underline !important }
As you've noted, changing link colors is trickier, because websites may
use backgrounds that make your chose colors useless. You can use
userContent.css to override the backgrounds as well, if you like, but
then you're kinda stuck with the entire web being black and white.
Something like
* { background: none !important;
color: black !important;
}
a:link { color: red !important;
text-decoration: underline !important;
}
a:visited { color: cyan !important
text-decoration: underline !important;
}
If you want to do it on a site-by-site basis, you have to add a section
for each site, using @-moz-document. Something like
@-moz-document url-prefix(
http://en.wikipedia.org/) {
a:link { color: red !important;
text-decoration: underline !important;
}
a:visited { color: cyan !important
text-decoration: underline !important;
}
}