need to install firefox after shutdown
firefox installed x2 after many years of use. have macOS...does not open after turning off Mac - this happened after a blackout but Mac was off at the time...my power backup did scream at me during the night so turned it off.
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Please explain the problem in detail. What happens? What is/are the exact error message(s) ?
Start Firefox using Troubleshoot(Safe) Mode {web link}
A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?