Seeing as wikipedia constantly delight in inserting free advertising for this site in every paragraph of theirs, this site has come into being.

sup.noprint {display: none;}

That piece of CSS will rid you of the varicose nuisance. Firefox users should place it in their usercontent.css file.

userContent.css

This file sets the display rules for web content and is located in the sub-folder called chrome in your profile folder. As with userChrome.css, this file does not exist by default, so you need to create it before you can start adding your preferences. As with userChrome.css, there is an example file that exists by default, called userContent-example.css. Basically, you can just rename that file by removing the -example part.