Please Refresh but do this 1st:

• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

then

• https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...:

• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

If is your Profile :

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Note: Any customization will revert back to default, you will also need to reinstall Extensions.

Please let us know if this solved your issue or if need further assistance.

Pkshadow,

Thanks for the reply. This, unfortunately, did not resolve the issue. I am beginning to think that this may be an applied security GPO that's causing the lockdown/restriction of Firefox. Specifically, when looking at the "about:config" settings for Firefox, we're seeing security.default_personal_cert set to "locked" "string" and "Ask every time".

Do you know where the settings for Firefox reside in Windows 7 group policy?

-LGz

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate. Need to update and go to their forums for answers.

• https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
• https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites
• https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
• https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
• http://kb.mozillazine.org/Error_loading_websites

Only other thing can think of is that is a big jump of versions. *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer As HTML

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

If they do not need their profile, wipe it out if they have their passwords after bookmarks are saved.

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

Uninstall Firefox and delete all folders on C:\ for it. Reinstall 52.5.3 ESR. It will continue to get security updates until May 2018, and you can download and install it from this page:

• https://www.mozilla.org/en-US/firefox/organizations/all/

Note : Legacy Extensions will be deleted or removed in any version update after May 2018.

• https://support.mozilla.org/en-US/kb/import-bookmarks-html-file

July will be last release I think.... Owners should start making plans for another system or.......

Please let us know if this solved your issue or if need further assistance.