5008: open bookmarks in a new tab

user.js

@@ -1706,6 +1706,9 @@ user_pref("browser.backspace_action", 2);
  * 1=current window, 2=new window, 3=most recent window
  * [SETTING] Options>General>Tabs>Open new windows in a new tab instead ***/
 user_pref("browser.link.open_newwindow", 3);
+/* 5008: open bookmarks in a new tab (FF57+)
+ * [NOTE] You can also use middle-click, cmd/ctl-click, and use the context menu ***/
+   // user_pref("browser.tabs.loadBookmarksInTabs", true)
 /* 5010: enable ctrl-tab previews ***/
 user_pref("browser.ctrlTab.previews", true);
 /* 5011: don't open "page/selection source" in a tab. The window used instead is cleaner