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Every time I restart FF on my Mac I see the Firefox Safe Mode warning box. What's going on?

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I get this attached warning box every time I restart FF on my Mac (2016 MBP, OSX 10.14.14) When I click on "Restore" FF informs me that it was unable to restore my last session. I have done a clean reinstall of the FF and have no add-ons running.

Thanks, John

I get this attached warning box every time I restart FF on my Mac (2016 MBP, OSX 10.14.14) When I click on "Restore" FF informs me that it was unable to restore my last session. I have done a clean reinstall of the FF and have no add-ons running. Thanks, John

Chosen solution

Make sure that you do not hold the Options key when you start Firefox.

Start Firefox in Safe Mode on Mac:

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Additional System Details

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  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15

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Question owner

for some reason the screenshot didn't upload the first time around.

for some reason the screenshot didn't upload the first time around.
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FredMcD
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4195 solutions 58556 answers

What's your computer system and Firefox version?

https://support.mozilla.org/en-US/kb/firefox-is-stuck-in-safe-mode


johnnylion said

unable to restore my last session

You may have corrupt sessionstore [v56] sessionstore.jsonlz4 file(s). Delete all sessionstore* files and the sessionstore-backups folder.

Type about:support<enter> in the address bar.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder

Linux: Under the page logo on the left side, you will see Application Basics. Under this find Profile Directory. To its right press the button Open Directory.

Locate the above file. Then rename or delete it. Restart Firefox.


Don't delete the files if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool: https://www.jeffersonscher.com/res/scrounger.html

What's your computer system and Firefox version? https://support.mozilla.org/en-US/kb/firefox-is-stuck-in-safe-mode ---------- ''johnnylion [[#question-1255720|said]]'' <blockquote> unable to restore my last session </blockquote> You may have corrupt '''sessionstore''' [v56] '''sessionstore.jsonlz4''' file(s). Delete all '''sessionstore*''' files and the '''sessionstore-backups''' folder. Type '''about:support'''<enter> in the address bar. Under the page logo on the left side, you will see '''Application Basics. ''' Under this find '''Profile Folder. ''' To its right press the button '''Show Folder. ''' This will open your file browser to the current Firefox profile. Now '''Close Firefox. ''' Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder '''Linux: ''' Under the page logo on the left side, you will see '''Application Basics.''' Under this find '''Profile Directory. ''' To its right press the button '''Open Directory. ''' Locate the above file. Then rename or delete it. Restart Firefox. '''Don't delete the files''' if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool: https://www.jeffersonscher.com/res/scrounger.html
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cor-el
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  • Moderator
17352 solutions 156837 answers

Chosen Solution

Make sure that you do not hold the Options key when you start Firefox.

Start Firefox in Safe Mode on Mac:

Make sure that you do not hold the Options key when you start Firefox. Start Firefox in Safe Mode on Mac: *Mac: hold down the Options key while starting Firefox *https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
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Question owner

Hah, so it turns out I use a keyboard shortcut (using Keyboard Maestro) to launch FF. It's "option-control-F". So, yup, I'm inadvertently holding down the option key while launching FF. Oops. If I launch through Spotlight search I don't have the problem.

Thanks Cor-el!

Hah, so it turns out I use a keyboard shortcut (using Keyboard Maestro) to launch FF. It's "option-control-F". So, yup, I'm inadvertently holding down the option key while launching FF. Oops. If I launch through Spotlight search I don't have the problem. Thanks Cor-el!
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