Bug 1162620 - Show visited links in about:crashed. r=dao

--HG--
extra : rebase_source : de56fcf1d5e56c7fe1b27d0e48cd1082f202612e

toolkit/themes/shared/in-content/common.inc.css

@@ -412,6 +412,10 @@ html|a:hover,
   text-decoration: underline;
 }
 
+html|a:visited {
+  color: #551a8b;
+}
+
 html|a:hover:active,
 .text-link:hover:active,
 .inline-link:hover:active {