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Due to a bug in Mac OS X High Sierra, fullscreen mode has some issues (bug 1390125) GSSAPI and Kerberos authentication do work in 64-Bit Windows Firefox. However it requires the advanced setting 'network.negotiate-auth.gsslib' to contain the string 'gssapi64.dll' because the default value (which is chosen if left empty) is wrong.
soundsgood said
Firefox 54.0.1 won't launch—not even in safe mode.
If you can't get Firefox to open, you will have to dothis the hard way.
https://support.mozilla.org/en-US/kb/mozillacrashreporterOpen the file browser / explorer on your computer.Note: You may have to enable Show HiddenFolders / Files. Enter this in the address bar;
Windows: %APPDATA%MozillaFirefoxCrash ReportssubmittedWin 7/Vista: C:Users<username>AppDataRoamingMozillaFirefoxCrash ReportssubmittedWin XP/2000: C:Documents and Settings<username>Application DataMozillaFirefoxCrash Reportssubmitted
Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submittedLinux: /home/<username>/.mozilla/firefox/Crash Reports/submitted
Copy the most recent 5-7 File Names in the folder.Post the information in the reply box.