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Firefox is not working: couldn't load XPCOM

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frankiki35 -  
Hello,
While visiting my father, he asked me to help him with his old PC running XP.
He couldn't update Flash Player to listen to music on Deezer.
After a few manipulations on my part, Firefox won't open anymore, and I get the following error message: couldn't load XPCOM.
Here’s what I’ve already tried after consulting numerous forums:
- antivirus and anti-malware scans, nothing to report
- launching Firefox in safe mode, same error message
- System Restore to several different dates, same problem
- trying to uninstall Firefox from the control panel, the uninstallation doesn’t start
- trying to uninstall from the helper file in the program files, the uninstallation doesn’t start
- trying to reinstall Firefox from an exe, the exe doesn’t launch
- complete uninstallation of Java and Flash Player, no better
I think that’s about it.
Can you please help me?
Thanks in advance.

1 answer

  1.  Malekal_morte- Moderator
    Hello,

    Do the last step: Reinstall Firefox as explained in the second paragraph of this page: Reset/Reinstall Firefox

    --
    Like the angel you are, you laugh creating a lightness in my chest,
    Your eyes they penetrate me,
    (Your answer's always 'maybe')
    That's when I got up and left
    1
    1. frankiki35 Author
      Thank you Malekal for your help, but it's not working.
      If I double-click on the Firefox icon while holding down the Shift key, I still get the error message Couldn't load XPCOM.
      And I can't uninstall Firefox from the control panel/add or remove programs... nothing happens.
      0
    2. Malekal_morte- Moderator
      @frankiki35Delete all Mozilla and Firefox folders by conducting a file search.
      and try to reinstall it.
      0
    3. frankiki35 Author
      My father has finally resigned himself to replacing his over 12-year-old PC.
      This resolves the issue with Firefox.
      Thank you Malekal for your help.
      0