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Firefox won't start after 6/21 update and causes crash in win 10

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Firefox won't start after 6/21 update and causes crash in win 10. Opening causes "Do you want to allow this app to make changes to your computer?" prompt. If I allow, FF does not open, Win slows and will crash. Trying to access/change Firefox profile or open FF in Safe mode does the same, so I cannot access these.

Firefox won't start after 6/21 update and causes crash in win 10. Opening causes "Do you want to allow this app to make changes to your computer?" prompt. If I allow, FF does not open, Win slows and will crash. Trying to access/change Firefox profile or open FF in Safe mode does the same, so I cannot access these.
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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

Hello kentmi, I noticed some other users recently with a similar problem which was caused by adware/malware. Here are a couple of tools which might help: Malwarebytes AdwCleaner and Norton Power Eraser

(Be sure to have Firefox closed when running scans)

Hello kentmi, I noticed some other users recently with a similar problem which was caused by adware/malware. Here are a couple of tools which might help: [https://support.malwarebytes.com/docs/DOC-1160 Malwarebytes AdwCleaner] and [https://support.norton.com/sp/static/external/NPE/5.3/prod/en/NPE.exe Norton Power Eraser] (Be sure to have Firefox closed when running scans)
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Question owner

Thanks, but did not work. I ran the Malwarebytes tool and while it found some PUPS, it did not solve the problem. I tried opening FF with same result. I approved changes, and my computer slows to basic lock up. Win 10 task manager (via Ctrl Alt Del) will not function either once I give permission and I have to shut down with power button.

Thanks, but did not work. I ran the Malwarebytes tool and while it found some PUPS, it did not solve the problem. I tried opening FF with same result. I approved changes, and my computer slows to basic lock up. Win 10 task manager (via Ctrl Alt Del) will not function either once I give permission and I have to shut down with power button.
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

Hi kentmi, Did you try Firefox in Safe Mode by press & hold the shift key while you launch?

Hi kentmi, Did you try Firefox in Safe Mode by press & hold the shift key while you launch?
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Question owner

Yes, with the same result. Command prompt "firefox.exe -p" failed as well.

Yes, with the same result. Command prompt "firefox.exe -p" failed as well.
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

You might want to consider backing up your profile and doing a clean install. Back up and restore information in Firefox profiles

Firefox keeps crashing at startup

You might want to consider backing up your profile and doing a clean install. [https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles Back up and restore information in Firefox profiles] [https://support.mozilla.org/en-US/kb/firefox-keeps-crashing-startup Firefox keeps crashing at startup]
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Question owner

Thanks, My_Cheese_Is_Slippin, I appreciate your time and expertise. I've found my profile and copied to desktop. I understand my profile will not be deleted by a clean install and unless I delete it and this the problem can persist. Should I delete it and then restore it after a clean install?

Thanks, My_Cheese_Is_Slippin, I appreciate your time and expertise. I've found my profile and copied to desktop. I understand my profile will not be deleted by a clean install and unless I delete it and this the problem can persist. Should I delete it and then restore it after a clean install?
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

Hi kentmi. Don't delete the copy of your profile.

After you do a clean install, don't Restore your profile until you are convinced that Firefox is working properly.

If it is, then there is a problem in your profile. You can select files from your profile to restore like Bookmarks & Passwords, but I would re-check add-ons for possible malicious content.

Hi kentmi. Don't delete the copy of your profile. After you do a clean install, don't Restore your profile until you are convinced that Firefox is working properly. If it is, then there is a problem in your profile. You can select files from your profile to restore like Bookmarks & Passwords, but I would re-check add-ons for possible malicious content.
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Question owner

Got it. But should I delete my profile from C:\AppData\Roaming\Mozilla\Firefox\Profiles? Uninstall does not delete this. Thanks

Got it. But should I delete my profile from C:\AppData\Roaming\Mozilla\Firefox\Profiles? Uninstall does not delete this. Thanks
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

Hi kentmi, I would. There is also another part of your profile in C:\AppData\Local\Mozilla\Firefox\Profiles I would delete that one , also.

Hi kentmi, I would. There is also another part of your profile in C:\AppData\Local\Mozilla\Firefox\Profiles I would delete that one , also.
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Question owner

Back up and running. I think good to go. Can I just copy and paste bookmarkbackups folder from old profile? Or just the last file in the folder? I did not copy C:\AppData\Local\Mozilla\Firefox\Profiles. Don't think this should matter.

Thanks so much for your patient assistance!

Back up and running. I think good to go. Can I just copy and paste bookmarkbackups folder from old profile? Or just the last file in the folder? I did not copy C:\AppData\Local\Mozilla\Firefox\Profiles. Don't think this should matter. Thanks so much for your patient assistance!
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
53 solutions 686 answers

Helpful Reply

Glad to hear it! Don't worry about the \Local\ folder. You should be able to copy the entire contents of the desktop folder to the C:\AppData\Roaming\Mozilla\Firefox\Profiles folder.

Glad to hear it! Don't worry about the \Local\ folder. You should be able to copy the entire contents of the desktop folder to the C:\AppData\Roaming\Mozilla\Firefox\Profiles folder.
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