XULrunner is no longer supported, and neither is XP. You may be trying to do the impossible

Firefox was working yesterday, an update changed something and now I get that error. Surely there is a way to go back where it was yesterday?

https://www.mozilla.org/firefox/52.7.4/releasenotes/

The Firefox 52.7.4 ESR was more for Windows 10 users in mind though it should not be a issue in running it on WinXP.

Here is the Firefox 52.7.3 ESR (32-bit) for Windows. http://archive.mozilla.org/pub/firefox/releases/52.7.3esr/win32/ http://archive.mozilla.org/pub/firefox/releases/52.7.3esr/win32/en-US/

Also keep in mind that Firefox 52.9.0esr out on June 26 will be the last major update for the old 52 ESR branch as 60 ESR will be the current then. Firefox 53.0 and later as you may know does not run on the EOL WinXP and Vista.

This is a big step forward. Firefox works....except that it locks up when I try to go into options to block auto updater.

Sorry, it is still buggered. Could someone please tell me what should have been running on 30 April? I can find the download but don't know what was running.

On April 30th Microsoft pushed out updates but no idea if it was the full range as Win 10 version 1803 was released. Firefox pushed out 59.03 and 52.7.4 on the 30th. https://ftp.mozilla.org/pub/firefox/releases/

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

You can check for problems with preferences.

• delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases
• http://kb.mozillazine.org/preferences_not_saved
• http://kb.mozillazine.org/resetting_preferences

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Pkshadow said

On April 30th Microsoft pushed out updates but no idea if it was the full range as Win 10 version 1803 was released. Firefox pushed out 59.03 and 52.7.4 on the 30th. https://ftp.mozilla.org/pub/firefox/releases/ <strike>Please let us know if this solved your issue or if need further assistance.</strike>

This is a Windows XP user and not using 10 and I already gave a link to 32-bit 52.7.3 esr for Windows.