Try using something like http://userstyles.org/ http://userstyles.org/ They have a Firefox extension, Stylish, which lets you apply custom user styles to sites

Try using something like http://userstyles.org/ http://userstyles.org/ They have a Firefox extension, Stylish, which lets you apply custom user styles to sites, to override the native CSS if it's not to your liking. Just like Greasemonkey for Firefox. I found it after becoming immensely frustrated with a site that had inexplicably decided to invert the colors for a:link and a:visited.