Firefox quit unexpectedly.
Firefox crashes at start up, and I have attempted to start in safe mode, reinstalled this version (which is 53.0.3), and I also installed an older version, and all with same problem: Firefox quit unexpectedly is the message I received. I am running macOS Sierra 10.12.5, and I believe my problem started after the last update.
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In the address bar, type about:crashes<enter>.
Note: If any reports do not have BP in front of the numbers/letters, click it to submit them.
The crash report is several pages of data. We need the report numbers to see the whole report.
Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Press the Reply button. Now go to the reply box and paste them in.
For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support +++++++++++++++++++++++ If you can't get Firefox to open, you will have to do this the hard way.
https://support.mozilla.org/en-US/kb/mozillacrashreporter Open the file browser / explorer on your computer. Note: You may have to enable Show Hidden Folders / Files. Enter this in the address bar;
Windows: %APPDATA%\Mozilla\Firefox\Crash Reports\submitted Win 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\submitted Win XP/2000: C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Crash Reports\submitted
Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submitted Linux: /home/<username>/.mozilla/firefox/Crash Reports/submitted
Copy the last 5-7 Recent File Names in the folder. Post the information in the reply box.