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 recent 7 - 10 Submitted crash reports, and copy them. Now go to the reply box and paste them in.

Please, Do not post a screenshot ! !

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support

Thank you for responding.

I am unable to even open Firefox so cannot get the crash reports from the address bar. I check the URL you sent and tried following the steps to get the crash reports in the AppData folder but I cannot see any.

Looks that something seriously went wrong with updating. NSIS is the installer used on the Windows platform.

Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

• download the Firefox installer and save the file to the desktop
  *https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

• do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including personal data in profiles created by other Firefox versions

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
• (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

• it is important to delete the Firefox program folder to remove all the files and make sure there are no problems with files that were leftover after uninstalling

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Reinstall Firefox

• https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems

Thank you for responding.

Clean installation does not make a difference. I was able to get around the uninstall error (local domain policy) but still cannot launch version 82.0. To check if it could be another policy, I removed the device from all other domain policies.

On a side note.. I had a user running 82.0 fine but after installing Windows patch KB4577671 Firefox started crashing on launch. Cant say for certain this is root cause as one other machine has patch applied but 82.0 working. I have 1 machine in my entire domain with a working version of Firefox 82.0.

I installed an older version (80.0.1) and that works fine.

do you happen to know which security software is running in your environment? (perhaps a similar issue as in https://bugzilla.mozilla.org/show_bug.cgi?id=1672367)

Specifically, do you have Digital Guardian running on your system? Currently we suspect it's to blame.

Apologies about the delayed response.

The root cause was identified as Digital Guardian.

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems.