Can you start Firefox in Safe Mode by holding down the Shift/Options key?

Can you open Firefox with the about:blank page?

• https://developer.mozilla.org/Command_Line_Options
• /Applications/Firefox.app/Contents/MacOS/firefox-bin about:blank

If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:

• bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

You can find the IDs of the submitted crash reports on the about:crashes page.

• You can open the about:crashes page via the location bar, like you open a website, or open the crash reports page via "Help > Troubleshooting Information".

See:

• http://kb.mozillazine.org/Mozilla_Crash_Reporter
• https://support.mozilla.org/kb/Mozilla+Crash+Reporter

If you can't open Firefox, see:

• http://kb.mozillazine.org/Mozilla_Crash_Reporter#Location_of_crash_reports
• http://kb.mozillazine.org/Mozilla_Crash_Reporter#Viewing_crash_reports

• https://developer.mozilla.org/How_to_get_a_stacktrace_for_a_bug_report

Firefox opens only 7 seconds and in this period I cannot enter any command. This also happens when I try to open the safe mode via the crash report and via both other ways as you describe. I have time to type "about:blank" or to change the startup page.

bp-329f6b00-556f-4869-ba79-a59ec2140304

I have -- no -- time to type "about:blank" or

You can check for corrupted and duplicate fonts and other font issues:

• http://www.thexlab.com/faqs/multipleappsquit.html - Font Book 2.0 Help: Checking for damaged fonts
• http://www.creativetechs.com/iq/garbled_fonts_troubleshooting_guide.html

yessss…. found it on thexlab.com !

It was a problem with some fonts. The site helped me identifying the problem and how to resolve it.

Thanks for the hint !!