--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1232,17 +1232,17 @@ sticky_pref("lightweightThemes.selectedT
 pref("browser.menu.showCharacterEncoding", "chrome://browser/locale/browser.properties");
 
 // Allow using tab-modal prompts when possible.
 pref("prompts.tab_modal.enabled", true);
 
 // Activates preloading of the new tab url.
 pref("browser.newtab.preload", true);
 // If preloading is enabled, preloads during an appropriate idle period.
-pref("browser.newtab.preload.on-idle", false);
+pref("browser.newtab.preload.on-idle", true);
 
 // Remembers if the about:newtab intro has been shown
 // NOTE: This preference is unused but was not removed in case
 //       this information will be valuable in the future.
 pref("browser.newtabpage.introShown", false);
 
 // Toggles the content of 'about:newtab'. Shows the grid when enabled.
 pref("browser.newtabpage.enabled", true);