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- Outdated Firefox- The outdated version of the Firefox app may cause this error.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.
Metoade 1: Basic Troubleshooting Metoaden
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 kaai, klik op de Krêft button at the bottom-left corner, and click on the Restart option to restart your PC.
2. Kontrolearje Ynternetferbining
An unstable Internet connection may hinder you from using the Firefox browser. You can check the speed of the connection using the Faasje 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. Launch ynstellings troch te drukken Windows + I toetsen mei-inoar.
2. Klik op Apps ynstellings.
3. Klik op Standert apps oan de linkerkant.
4. Scroll down and click on the current Webblêder.
5. Choose from the option as per your preference.
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4. Wiskje tydlike bestannen
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. Rinne Windows Update Troubleshooter út
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. Fier Systeem weromsette
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. Druk op de Windows-kaai, type firefox en klikje op 'e Run as administrator opsje.
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 de Windows-kaai, type Firefox en klikje op Iepen.
2. Klik op 'e Iepenje applikaasjemenu button (indicated by the three horizontal lines) at the top-right corner of the home page and click on the ynstellings opsje op de werjûn list.
3. Yn de Algemien tab, klik op de Kontrolearje op fernijings knop yn 't Firefox Updates ôfdieling.
4. Jo sille sjen de Firefox is aktueel message on the Firefox Updates section.
Noat: 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 from the Windows sykjen balke.
2. Folgjende, klik op de Iepenje applikaasjemenu knop en klikje op de Help opsje op de werjûn list.
3. Klik op 'e Modus foar problemen oplosse... yn de Firefox help finster.
4. No, klik op de Restart knop op de Firefox opnij starte yn Troubleshoot Mode pop-up finster.
5. Klik op 'e Ferfarskje Firefox knop op de Open Firefox in Troubleshoot Mode confirmation window.
6. Klik dan op de Ferfarskje Firefox knop op de Refresh Firefox to its default settings finster.
7. As lêste, klikje op de Ein knop op de 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. iepenje de mozilla Firefox app from the Windows sykjen balke.
2. Klik op 'e Iepenje applikaasjemenu knop en klikje op de Help opsje op de werjûn list.
3. No, klik op de Modus foar problemen oplosse... yn de Firefox help finster.
4. Klik op 'e Iepen knop op de Firefox opnij starte yn Troubleshoot Mode pop-up finster.
5. Folgjende, klik op de Iepenje applikaasjemenu knop en klikje op de Add-ons en tema's opsje op 'e list.
6. Klik op 'e Tafoegings tab on the left pane of the next window and toggle út the add-ons on the window.
7. Klik dan op de trije horizontale stippen button on the add-on and click on the Weinimme button on the list.
8. Klik op 'e Weinimme 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. iepenje de Mozilla Firefox app.
2. Klik op 'e Iepenje applikaasjemenu knop en klikje op de blêdwizers opsje yn 'e werjûn list.
3. Yn de blêdwizers menu, klik op de Blêdwizers beheare option at the bottom of the list.
4. Yn de Biblioteek skerm, klikje op 'e Import and Backup button at the menu bar and click on the Export Bookmarks to HTML… option in the drop-down menu displayed.
5. Yn de Export Bookmarks File window, browse and select a location, and click on the Rêde 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. Start de Firefox browser app.
2. Type oer: profilen in the URL address bar at the top and press the Yngean kaai om de About Profiles finster.
3. Klik op 'e Meitsje in nij profyl button on the window.
4. Folgjende, klik op de Folgjende knop op de Welcome to the Create Profile Wizard.
5. Type a name for the Profile in the Fier nije profylnamme yn fjild en klik op de Ein button in the window to create the Profile.
Noat: Klik op de 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. Druk op de Windows-kaai, type kontrôlepaniel en klikje op Iepen.
2. Click on the option Kategory yn de Sjoch by drop-down menu and click on the In programma ferwiderje opsje yn 'e Programs kopieare.
3. Selektearje it Mozilla Firefox (x64 en-US) in the list, click on the -ynstallaasje button at the top of the bar and click on the Ja knop op it UAC-finster.
4. Klik dan op de Folgjende knop yn 't Mozilla Firefox Uninstall wizard.
5. Folgjende, klik op de -ynstallaasje button in the next window.
6. Klik op 'e Ein button on the last window to completely uninstall the Firefox app.
7. Druk op de Windows+ E kaaien together to open the File Explorer and navigate to the This PC > Local Disk (C:) > Program Files > Mozilla Firefox folder.
8. Rjochts-klikke op de mozilla Firefox map en klikje op de wiskje 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 de Windows-kaai, type google chrome en klikje op Iepen.
Noat: You can use any web browser to download the Firefox browser on your PC.
2. Iepenje de offisjele webside fan de Mozilla Firefox browser on Google Chrome and click on the Download Firefox button on the window.
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. iepenje de Firefox app.
2. Klik op 'e Iepenje applikaasjemenu knop en klikje op de ynstellings opsje op de werjûn list.
3. Yn de Algemien tab, klik op de Ynstellings ... knop yn 't Netwurkynstellings ôfdieling.
4. Selektearje it Manual proxy configuration opsje op 'e Ferbining ynstellings finster.
5. Type SOCKS Host: 127.0.0.1 Port: 9050 yn de HTTP-proxy fjild, type 8080 yn de Haven field, and click on the OK knop.
6. Typ dan Oer: config on the search bar of the Firefox browser and click on the Akseptearje it risiko en trochgean knop.
7. Finally, type network.proxy.socks_remote_dns yn de sykbalke en klik op de toggle button to set the type of the entry to be wier.
8. No, type https://check.torptoject.org/ in the search bar on the Firefox browser and press the Yngean key to check the issues with the Tor Browser.
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It artikel besprekt de metoaden om te reparearjen 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.