Is it crashing during startup, after startup . . . . What's your computer system and Firefox version? --------------- [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode] {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there? While still in Safe Mode, 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''' '''Submitted''' crash reports, and '''copy''' them. Now go to the reply box and '''paste''' them in. ;[[Image:aboutcrashesFx57|width=500]] 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 '''The crash report is several pages of data.''' '''We need the report numbers to see the whole report.''' Copy the most recent '''5-7 File Names''' in the folder. Post the information in the reply box.