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Firefox on start says couldn't load XPCOM

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I use latest version of Firefox on my Windows XP SP2 and when I try to launch Firefox it only says couldn't load XPCOM and also no one of others browsers( I tried IE, Chrome) doesn't works, simply they do nothing- Please HELP.

Chosen solution

Seems a bit of default solution for "couldn't load XPCOM" - uninstalling FF.

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Additional System Details

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  • User Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17

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Tyler Downer
  • Administrator
  • Moderator
1164 solutions 6635 answers

First, update your computer to Service Pack 3.

Then, scan for viruses. Troubleshoot Firefox issues caused by malware

Then, download Firefox from www.getfirefox.com and install it (don't remove Firefox first)

If you are using any registry cleaners or the like immediately uninstall them.

Question owner

but I can not update my comp or download anything because no one of Web browsers doesnt works.

Tyler Downer
  • Administrator
  • Moderator
1164 solutions 6635 answers

Then something is majorly wrong with your machine. Take it to a local, reputable computer repair shop, tell them you want to use Firefox but none of the browsers on your computer work. They should fix the machine, updated it, remove any viruses and you should be good to go.

Question owner

Yeah, but there is inly one problem: That I want to save my many.

Tyler Downer
  • Administrator
  • Moderator
1164 solutions 6635 answers

Well we can't really help you here. You can try downloading the tools I gave you a link to on a another computer and put them on a USB drive, but diagnosing a whole computer problem is beyond the scope of this site.

Question owner

Thanks anyway. I still think that Firefox caused problem that other browsers won't works.

Tyler Downer
  • Administrator
  • Moderator
1164 solutions 6635 answers

Firefox can't cause a problem to keep other browsers from working, so that's not possible.

cor-el
  • Top 10 Contributor
  • Moderator
10743 solutions 96657 answers

Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

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

Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

If you keep having problems then also create a new profile.


ffw62 2 solutions 19 answers

Chosen Solution

Seems a bit of default solution for "couldn't load XPCOM" - uninstalling FF.

ociepka 0 solutions 2 answers

For me ZoneAlarm Security was the problem.

Open Task Manager. Do a Ctrl + Alt + Del and open Task Manager. Select ZoneAlarm Force Field and click End Task.

If Firefox now works here is how to cure the problem.

Open ZoneAlarm. In the Internet box click on View Details. Turn off Web Security. This will cause a Fix it button to appear. Click on the Fix it button. Web security will be set back to on and Browser Virtualization will be turned off. Turn on Brower Virtualization. Close ZoneAlarm.

Firefox should now work.