also top sites and highlights on the home page are not showing.

This is the best way to uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles Reinstall with Current Release Firefox 57.0.1 with a Full Version Installer https://www.mozilla.org/firefox/all/ Note : Updated version # has some fixes for a Mac You or Firefox have turn off the New Tab Features they can be put back with the tiny gear icon upper right corner of a new tab if choose to do so or options as to what is there. Copy/Paste about:preferences#privacy in to Address Bar and Enter History is 2nd one down, is it Marked : Remember History ? The old date base is your Profile, bookmarks, passwords, history...lol Save for now. Please let us know if this solved your issue or if need further assistance.