Mozilla Firefox is a trusted Web Browser and is compatible with most devices. However, the Couldn’t load XPCOM error message pops up now and then. The XPCOM is a cross-platform component model from the Mozilla Firefox, so the Cannot load XPCOM error disrupts the browsing. You may click on the OK button to close the error message, but you may not be able to use the Firefox app. The article addresses the error and the methods to resolve the XPCOM Firefox error are explained here.
How to Fix Mozilla Firefox Couldn’t Load XPCOM Error on Windows 10
The list of causes for which the XPCOM error occurs on Firefox is given in this section.
- Outdated Firefox- The outdated version of the Firefox app may cause this error.
- Corrupt Firefox User Profile- The User Profile on the Firefox Web Browser may be corrupt or may have malware sources.
- Third-party Extensions on Firefox- The issue with the XPCOM may arise if there are third-party extensions installed on the Firefox app.
- Corrupt System Files- The System files installed locally on your PC may have been corrupt or the PC may be infected with a virus.
Método 1: Métodos básicos de resolución de problemas
The first approach to solve the Couldn’t load XPCOM error is to try the basic troubleshooting methods listed in this section.
1. Reinicie o PC
There might be some glitches on your PC that prevent you from using the Firefox browser; you can restart your PC to fix the error. Press the Windows tecla, fai clic na tecla poder button at the bottom-left corner, and click on the Reinicia opción para reiniciar o seu PC.
2. Verifique a conexión a Internet
An unstable Internet connection may hinder you from using the Firefox browser. You can check the speed of the connection using the Proba de velocidade and assess its quality.
- If the speed is low, try using any other Wi-Fi network for browsing on Firefox.
- Consider changing the data plan of the Internet Connection to a better plan.
3. Switch to Another Web Browser
If the XPCOM error with the Firefox Web Browser is still not resolved, you can try switching to another Web Browser like Google Chrome. Follow the steps below to switch to a different browser:
1. Lanzamento Configuración presionando Teclas Windows + I xuntos.
2. Prema en Apps configuración.
3. Prema en Aplicacións predeterminadas no panel esquerdo.
4. Scroll down and click on the current Navegador web.
5. Choose from the option as per your preference.
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4. Eliminar ficheiros temporais
The numerous temporary files saved locally on your PC may have disrupted the browsing activity on Firefox. You can read the method to delete the temp files on your PC using the link given here.
5. Repair Corrupt Files
The files on your PC may be corrupt and have some issues which may cause the Couldn’t load XPCOM error. Read the article to repair system files on Windows 10 for corrupt files using the link provided here.
6. Actualiza Windows
In most instances, using an outdated OS may cause issues on the PC; you need to update the Windows on your PC to the latest version to fix this error. Read the article on how to update Windows on your PC using the link given here.
7. Executa o Resolución de problemas de Windows Update
The issues with the Firefox browser can be cleared by using the Windows Troubleshooter on your PC. Read the method to run the Windows Troubleshooter using the link here and fix the error.
8. Disable Antivirus Temporarily (If Applicable)
The third-party security services on your PC may disrupt you from using the Firefox app; you can disable the anti-virus program to fix this error. Implement the steps given in the link here to disable the Anti-virus software on your PC.
9. Realice a Restauración do sistema
If the Firefox app performed better on the previous version of the Windows PC, you can try performing a System Restore on your PC to fix the error. The link which is given here will provide you with the method to perform a System Restore on your PC.
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Method 2: Run Firefox as Administrator
The Couldn’t load XPCOM error might appear if the Firefox is not granted the administrative permissions on your PC. You have to run the Firefox app as an Administrator on your Pc to fix the error.
1. Preme o botón Tecla Windows, escriba Firefox e prema o Executar como administrador opción.
Method 3: Update Firefox Browser
Using an outdated version of the Firefox Web Browser can be a reason for this error. Follow the steps below to update the Firefox app on your PC.
1. Bate o Tecla Windows, escriba Firefox e prema en aberto.
2. Fai clic no botón Abre o menú da aplicación button (indicated by the three horizontal lines) at the top-right corner of the home page and click on the Configuración option on the list displayed.
3. No xeral na pestana, faga clic no botón Verifique se hai actualizacións botón no Actualizacións de Firefox sección.
4. Verás o Firefox is up to date message on the Firefox Updates section.
Nota: If there is an update for the Firefox browser, you will be prompted accordingly.
Method 4: Refresh Firefox Browser
To fix the Couldn’t load XPCOM error on the Firefox app, you can refresh Firefox entirely.
1. Inicia o Firefox aplicación da Busca de Windows bar.
2. A continuación, fai clic no botón Abre o menú da aplicación botón e prema no botón axudar option on the list displayed.
3. Fai clic no botón Modo de resolución de problemas... no Firefox help fiestra.
4. Agora, fai clic no botón Reinicia botón no Reinicie Firefox no modo de solución de problemas ventá emerxente.
5. Fai clic no botón Actualizar o Firefox botón no Open Firefox in Troubleshoot Mode xanela de confirmación.
6. A continuación, faga clic no botón Actualizar o Firefox botón no Refresh Firefox to its default settings fiestra.
7. Finalmente, fai clic no botón Rematar botón no Import Complete window to Refresh Firefox completely.
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Method 5: Disable Firefox Extensions
The extensions on the Firefox Web Browser can be a reason for the Couldn’t load XPCOM error. You can disable the extensions on the browser to fix the error.
1. Abre o Mozilla Firefox aplicación da Busca de Windows bar.
2. Fai clic no botón Abre o menú da aplicación botón e prema no botón axudar option on the list displayed.
3. Agora, fai clic no botón Modo de resolución de problemas... no Firefox help fiestra.
4. Fai clic no botón aberto botón no Reinicie Firefox no modo de solución de problemas ventá emerxente.
5. A continuación, fai clic no botón Abre o menú da aplicación botón e prema no botón Complementos e temas option on the list.
6. Fai clic no botón Extensións tab on the left pane of the next window and toggle fóra the add-ons on the window.
7. A continuación, faga clic no botón tres puntos horizontais button on the add-on and click on the Eliminar button on the list.
8. Fai clic no botón Eliminar button on the confirmation pop-up message window.
Method 6: Create New Firefox Profile
The current User Profile on the Firefox web browser may be corrupt; you can create a new User Profile to fix the Couldn’t load XPCOM error.
Step I: Import Saved Bookmarks
As a first step, you need to import the Bookmarks you have saved on the current User Profile to avoid any loss of data.
1. Abre o Mozilla Firefox app.
2. Fai clic no botón Abre o menú da aplicación botón e prema no botón Marcadores option in the list displayed.
3. No Marcadores menú, fai clic en Xestionar os marcadores option at the bottom of the list.
4. No Biblioteca prema na pantalla Import and Backup button at the menu bar and click on the Export Bookmarks to HTML… option in the drop-down menu displayed.
5. No Export Bookmarks File window, browse and select a location, and click on the gardar button to save the bookmarks file.
Step II: Create New User Profile
This section will introduce the method to create a new User Profile on the Firefox app to fix the Couldn’t load XPCOM error.
1. Inicia o Firefox aplicación de navegador.
2. Tipo about: perfís in the URL address bar at the top and press the Entrar clave para abrir o ficheiro About Profiles fiestra.
3. Fai clic no botón Crea un novo perfil button on the window.
4. A continuación, fai clic no botón seguinte botón no Welcome to the Create Profile Wizard.
5. Type a name for the Profile in the Insira un novo nome de perfil campo e fai clic no Rematar button in the window to create the Profile.
Nota: preme o Choose Folder… button to change the location for storing the User Profile name instead of the default location.
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Method 7: Reinstall Firefox
The Firefox app installed on your PC might be corrupt or not properly installed. You can reinstall Firefox on your PC to fix the Couldn’t load XPCOM error.
Step I: Uninstall Firefox
The first step is to uninstall the existing version of the Firefox web browser on your PC using the Control Panel.
1. Preme o botón Tecla Windows, escriba panel de control e prema en aberto.
2. Fai clic na opción categoría no Ver por drop-down menu and click on the Desinstalar un programa opción no Programas Título.
3. Seleccione o Mozilla Firefox (x64 en-US) in the list, click on the Uninstall button at the top of the bar and click on the si botón na xanela UAC.
4. A continuación, faga clic no botón seguinte botón no Mozilla Firefox Uninstall asistente.
5. A continuación, fai clic no botón Uninstall button in the next window.
6. Fai clic no botón Rematar button on the last window to completely uninstall the Firefox app.
7. Preme o botón Windows+ E claves together to open the File Explorer and navigate to the This PC > Local Disk (C:) > Program Files > Mozilla Firefox cartafol.
8. Fai clic co botón dereito no botón Mozilla Firefox cartafol e fai clic no Borrar option on the list to delete the files.
Step II: Reinstall Firefox
The next step to fix the Couldn’t load XPCOM error is to reinstall the Firefox Web Browser on your PC.
1. Bate o Tecla Windows, escriba Google Chrome e prema en aberto.
Nota: You can use any web browser to download the Firefox browser on your PC.
2. Abre o sitio web oficial do Navegador Mozilla Firefox on Google Chrome and click on the Descargar Firefox button on the window.
3. Double-click on the downloaded executable file Firefox Installer.exe to run the installation file.
4. Agarde a que finalice o proceso de instalación.
5. Inicia o Firefox Web Browser app on your PC.
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Method 8: Modify Tor Web Browser Settings
If you are using the Tor Web browser, in addition to Firefox, the issues on the Tor browser may cause the Couldn’t load XPCOM error. To fix this error, you can try checking for the issues on the Tor browser using Firefox to fix the error.
1. Abre o Firefox app.
2. Fai clic no botón Abre o menú da aplicación botón e prema no botón Configuración option on the list displayed.
3. No xeral na pestana, faga clic no botón Configuración ... botón no Configuración da rede sección.
4. Seleccione o Manual proxy configuration opción no Configuración de conexión fiestra.
5. Tipo SOCKS Host: 127.0.0.1 Port: 9050 no Proxy HTTP campo, tipo 8080 no Porta field, and click on the OK botón.
6. A continuación, escriba Acerca de: config on the search bar of the Firefox browser and click on the Acepta o risco e continúa botón.
7. Finally, type network.proxy.socks_remote_dns in the search bar and click on the alternar button to set the type of the entry to be certo.
8. Agora escribe https://check.torptoject.org/ in the search bar on the Firefox browser and press the Entrar key to check the issues with the Tor Browser.
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O artigo discute os métodos para corrixir couldn’t load XPCOM Firefox error on Windows 10 PC. Try implementing the methods discussed in the article to fix the error and please leave your suggestions on the same in the comments section. If you have any queries on the Cannot load XPCOM error, post them in the comments.