diff --git a/user.js b/user.js
index 87792ca..90c6dde 100644
--- a/user.js
+++ b/user.js
@@ -1090,7 +1090,7 @@ user_pref("layout.spellcheckDefault", 0); // 0=none, 1-multi-line, 2=multi-line
 // user_pref("browser.quitShortcut.disabled", true); // disable Ctrl-Q quit shortcut [LINUX] [MAC] [FF87+]
 // user_pref("browser.tabs.closeWindowWithLastTab", false);
 // user_pref("browser.tabs.loadBookmarksInTabs", true); // open bookmarks in a new tab [FF57+]
-// user_pref("browser.urlbar.decodeURLsOnCopy", true);
+// user_pref("browser.urlbar.decodeURLsOnCopy", true); // [FF53+]
 // user_pref("general.autoScroll", false); // middle-click enabling auto-scrolling [DEFAULT: false on Linux]
 // user_pref("ui.key.menuAccessKey", 0); // disable alt key toggling the menu bar [RESTART]
 // user_pref("view_source.tab", false); // view "page/selection source" in a new window [FF68+, FF59 and under]