Tip & How-To about Microsoft Windows XP Professional SP2

Xpcom_core.dll file error

The xpcom_core.dll is included with Mozilla (Firefox) enables the Mozilla program to be an actual framework. The xpcom_core.dll module provides a development environment that includes file abstraction, component management, memory management and object message passing for software developers.This DLL allows for the access of components that can be contacted from a web browser or scripted from any application from Mozilla.
If you're having an issue with your xpcom_core.dll file, the exact message displayed will vary. A few examples are listed below:

  • "The dynamic link library xpcom_core.dll could not be found in the specified path"
  • "Missing component xpcom_core.dll"
  • "This application has failed to start because xpcom_core.dll was not found"
  • "xpcom_core.dll is not loaded"

This dll file can be downloaded by clicking here

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1 Answer

What do xpcom mean when trying to get on to internet site as it keeps comeing up cannot load xpcom


Certain Firefox problems can be solved by performing a Clean reinstall. (XPCOM problems require a reinstall) This means you remove Firefox program files (not any bookmarks etc. in your profile folder) and then reinstall Firefox. Please follow these steps:
Note: You might want to print these steps or view them in another browser.
  1. Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
  2. After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
  3. Delete the Firefox installation folder, which is located in one of these locations, by default:
    • Windows:
      • C:\Program Files\Mozilla Firefox
      • C:\Program Files (x86)\Mozilla Firefox
    • Mac: Delete Firefox from the Applications folder.
    • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
  4. Now, go ahead and reinstall Firefox:
    1. Double-click the downloaded installation file and go through the steps of the installation wizard.
    2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

Apr 26, 2015 | Computers & Internet

1 Answer

Cannot load XPCOM for Mozilla firefox


The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.
To Reset Firefox do the following:
  1. Go to Firefox > Help > Troubleshooting Information.
  2. Click the "Reset Firefox" button.
  3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
  4. Firefox will open with all factory defaults applied.

Oct 01, 2014 | Mozilla Firefox

1 Answer

could not load xpcom


This exact question is answered on this support page at Mozilla
https://support.mozilla.org/en-US/questions/965228

Mar 31, 2014 | Mozilla Firefox

1 Answer

when i try to start my firefox,the error comes up saying "the application or DLL C:/program files/mozilla firefox/nss3.dll"


Sounds like your installation is either corrupted or a file has been accidentally deleted. try re-installing and see if that fixes it up.

Aug 30, 2009 | Mozilla Firefox

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