remove layout.css.visited_links_enabled, #933

This no longer has any affect since FF77+: see https://bugzilla.mozilla.org/1632765

user.js

@@ -455,14 +455,6 @@ user_pref("keyword.enabled", false);
 user_pref("browser.fixup.alternate.enabled", false);
 /* 0803: display all parts of the url in the location bar ***/
 user_pref("browser.urlbar.trimURLs", false);
-/* 0805: disable coloring of visited links - CSS history leak
- * [NOTE] This has NEVER been fully "resolved": in Mozilla/docs it is stated it's
- * only in 'certain circumstances', also see latest comments in [2]
- * [TEST] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use)
- * [1] https://dbaron.org/mozilla/visited-privacy
- * [2] https://bugzilla.mozilla.org/147777
- * [3] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector ***/
-user_pref("layout.css.visited_links_enabled", false);
 /* 0807: disable live search suggestions
 /* [NOTE] Both must be true for the location bar to work
  * [SETUP-CHROME] Change these if you trust and use a privacy respecting search engine