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. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) 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 *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Reinstall with Current Release Firefox 57.0.3 with a Full Version Installer *https://www.mozilla.org/firefox/all/ Please let us know if this solved your issue or if need further assistance.

If you use uBlock Origin then this could be a problem with this extension. See: [/questions/1197251] Facebook newsfeed not working correctly

See also: *[[/questions/1197250]] 57.0.3 update causing facebook refresh problems? *https://www.reddit.com/r/uBlockOrigin/comments/7mxddl/facebook_newsfeed_going_crazy_when_ublock_on/drxioqo/