Usually there would be some shortcuts when I open new tab page. But they were gone on the new page from yesterday. Of course I didn't change setting and didn't install any add-ons. I disabled all add-ons. But problem not solved. I checked 'preferences-home-Firefox home contents', but I cannot see any options(that area is just empty). I also checked 'about:config' : * browser.newtabpage.enabled → true * browser.newtabpage.activity-stream.feeds.section.topstories → true * browser.newtabpage.activity-stream.showSearch → true And I compared between 'about:newtab' and 'about:blank'. I found something that background color of new page are different. There are some HTML code in 'about:newtab' when I use F12. But I don't know what is wrong with this.