diff --git a/user.js b/user.js
index 604f21f..c5c084c 100644
--- a/user.js
+++ b/user.js
@@ -1632,6 +1632,7 @@ user_pref("_user.js.parrot", "5000 syntax error: this is an ex-parrot!");
    // user_pref("browser.urlbar.decodeURLsOnCopy", true); // see bugzilla 1320061 [FF53+]
    // user_pref("general.autoScroll", false); // middle-click enabling auto-scrolling [WINDOWS] [MAC]
    // 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]
 /* OTHER ***/
    // user_pref("browser.bookmarks.max_backups", 2);
    // user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false); // disable CFR [FF67+]