How to Fix Xpcom.dll Error

Dll errors can be nasty, as they can prevent you from doing things on your computer. The xpcom.dll error is one of them. This error usually occurs when you try to clear browser history in the Opera browser and it doesn’t work. That’s because the xpcom.dll file is missing and causing the error. As a result you are stuck with bloated browser cache. Here are some tips that will help you fix the xpcom.dll error.

To fix the problem on a temporary basis, simply uncheck “Delete plug-in data” when you are clearing the cache. This will allow you to delete most of the temporary files without the error occurring. Even though this is a short-term fix, it’s quite effective and will allow you to speed up your browser.

If you are looking for a permanent fix, then you should tweak some Opera options. Because xpcom.dll is a file that belongs to Firefox, it’s not needed in Opera and causes a conflict. So, to fix the problem you need to resolve the conflict. Here is how:

  1. Type opera:plugins in your browser address bar and press Enter
  2. Then go through the list of plugins and disable all that say Firefox
  3. The xpcom.dll error should be fixed

If you want to re-enable your plugins, enable them one by one. That way you will know which plugin causes the problem if it comes back.

Reinstall xpcom.dll

Sometimes the xpcom.dll fix doesn’t work. That’s when the best thing to do is reinstall xpcom.dll files. You can find the file in one of the trusted dll libraries, such as Simply download the files and install them. The error should be fixed.

Clean the registry

Sometimes the only way to fix dll errors is to repair the Windows registry. If there are registry errors, they can be responsible for xpcom errors. Repairing the registry with a trusted and reliable registry cleaner will repair erroneous settings and fix xpcom.dll.

Hopefully these tips will help you fix the xpcom.dll error once and for all.

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Most DLL errors are caused by the "registry database" of Windows.
This is a storage facility for all the files, settings and options that Windows uses to help it run. The problem is that there is a large list of DLL files your software uses to run - this list is highly important but is continually being damaged, causing the errors you're seeing. You can easily fix this problem by using a "registry cleaner" program to repair any registry errors your system has.