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- Outdated Firefox- The outdated version of the Firefox app may cause this error.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.
Method 1: Basis Troubleshooting Methoden
The first approach to solve the Couldn’t load XPCOM error is to try the basic troubleshooting methods listed in this section.
1. Restart 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 Schlëssel, klickt op de Power button at the bottom-left corner, and click on the Neistart Optioun fir Äre PC nei ze starten.
2. Check Internetverbindung
An unstable Internet connection may hinder you from using the Firefox browser. You can check the speed of the connection using the Speed Test 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. Start Parameteren duerch dréckt Windows + I Schlësselen zesummen.
2. Klickt op Apps Kader.
3. Klickt op Standard Apps op der lénker Säit.
4. Scroll down and click on the current Webbrowser.
5. Choose from the option as per your preference.
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4. Läscht temporär Dateien
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. Update 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. Run Windows Update Troubleshooter
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. Leeschtung System Restauréieren
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. Dréckt de Windows Schlëssel, Typ Firefox a klickt op de Führen als Administrator Optioun.
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. Hit der Windows Schlëssel, Typ Firefox a klickt op Open.
2. Klickt op déi Open Applikatioun Menu button (indicated by the three horizontal lines) at the top-right corner of the home page and click on the Parameteren option on the list displayed.
3. An allgemeng klickt op den Iwwerpréift fir Updates Knäppchen an der Firefox Updates Rubrik.
4. Dir gesitt de Firefox is up to date message on the Firefox Updates section.
Opgepasst: 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. Start de Firefox App aus der Windows Sich Bar.
2. Nächst, klickt op de Open Applikatioun Menu Knäppchen a klickt op de Hëllef option on the list displayed.
3. Klickt op déi Troubleshoot Mode… an Firefox Hëllef Fënster.
4. Elo, klickt op de Neistart Knäppchen op der Restart Firefox am Troubleshoot Modus Pop-up Fënster.
5. Klickt op déi Firefox aktualiséieren Knäppchen op der Open Firefox in Troubleshoot Mode Confirmatiouns Fënster.
6. Da klickt op de Firefox aktualiséieren Knäppchen op der Refresh Firefox to its default settings Fënster.
7. Endlech klickt op de Freck Knäppchen op der 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. Open de Mozilla Firefox App aus der Windows Sich Bar.
2. Klickt op déi Open Applikatioun Menu Knäppchen a klickt op de Hëllef option on the list displayed.
3. Elo, klickt op de Troubleshoot Mode… an Firefox Hëllef Fënster.
4. Klickt op déi Open Knäppchen op der Restart Firefox am Troubleshoot Modus Pop-up Fënster.
5. Nächst, klickt op de Open Applikatioun Menu Knäppchen a klickt op de Add-ons an Themen option on the list.
6. Klickt op déi Betriebsdauer tab on the left pane of the next window and toggle ugefaangen the add-ons on the window.
7. Da klickt op de dräi horizontal Punkte button on the add-on and click on the ewechhuelen button on the list.
8. Klickt op déi ewechhuelen 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. Open de Mozilla Firefox App.
2. Klickt op déi Open Applikatioun Menu Knäppchen a klickt op de Lieszeeche Optioun an der Lëscht ugewisen.
3. An Lieszeeche Menü, klickt op de Verwalten Lieszeeche option at the bottom of the list.
4. An Bibliothéik Écran klickt op Import a Backup button at the menu bar and click on the Export Lieszeechen op HTML ... option in the drop-down menu displayed.
5. An Export Bookmarks Datei window, browse and select a location, and click on the spueren Knäppchen fir d'Lieszeechendatei ze späicheren.
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. Start de Firefox Browser App.
2. Typ iwwer: Profiler in the URL address bar at the top and press the gitt Schlëssel fir den Iwwer Profiler Fënster.
3. Klickt op déi Erstellt en neie Profil Knäppchen op der Fënster.
4. Nächst, klickt op de nächst Knäppchen op der Wëllkomm op der Create Profil Wizard.
5. Type a name for the Profile in the Gitt neie Profilnumm an Feld a klickt op de Freck Knäppchen an der Fënster fir de Profil ze kreéieren.
Opgepasst: Klickt op d ' Choose Folder… button to change the location for storing the User Profile name instead of the default location.
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Method 7: Firefox nei installéieren
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. Dréckt de Windows Schlëssel, Typ Kontrollpatroun a klickt op Open.
2. Click on the option Kategorie an Vue vun drop-down menu and click on the Deinstalléiert e Programm Optioun an der Programmer Rubrik.
3. Wielt d ' Mozilla Firefox (x64 en-US) in the list, click on the Installéieren Knäppchen um Top vun der Bar a klickt op de Jo Knäppchen op der UAC Fënster.
4. Da klickt op de nächst Knäppchen an der Mozilla Firefox Uninstall Assistent.
5. Nächst, klickt op de Installéieren button in the next window.
6. Klickt op déi Freck button on the last window to completely uninstall the Firefox app.
7. Dréckt de Windows+ E Tastekombinatiounen together to open the File Explorer and navigate to the This PC > Local Disk (C:) > Program Files > Mozilla Firefox Dossier.
8. Riets-klickt op de Mozilla Firefox Dossier a klickt op de läsche 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. Hit der Windows Schlëssel, Typ google chrome a klickt op Open.
Opgepasst: You can use any web browser to download the Firefox browser on your PC.
2. Open déi offiziell Websäit vun der Mozilla Firefox Browser on Google Chrome and click on the Luet Firefox Knäppchen op der Fënster.
3. Double-click on the downloaded executable file Firefox Installer.exe to run the installation file.
4. Wait for the installation process to complete.
5. Start de 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. Open de Firefox App.
2. Klickt op déi Open Applikatioun Menu Knäppchen a klickt op de Parameteren option on the list displayed.
3. An allgemeng klickt op den Astellungen ... Knäppchen an der Network Settings Rubrik.
4. Wielt d ' Manual proxy configuration Optioun op der Verbindungsastellungen Fënster.
5. Typ SOCKS Host: 127.0.0.1 Port: 9050 an Http Proxy Feld, Typ 8080 an Port field, and click on the OK Knäppchen.
6. Dann Typ Iwwer: config on the search bar of the Firefox browser and click on the Akzeptéiert de Risiko a Fuert weider Knäppchen.
7. Finally, type network.proxy.socks_remote_dns an der Sichbar a klickt op de toggle button to set the type of the entry to be richteg.
8. Elo, Typ https://check.torptoject.org/ in the search bar on the Firefox browser and press the gitt key to check the issues with the Tor Browser.
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Den Artikel diskutéiert d'Methoden fir ze fixéieren 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.