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- Outdated Firefox- The outdated version of the Firefox app may cause this error.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.
Dull 1: Dulliau Datrys Problemau Sylfaenol
The first approach to solve the Couldn’t load XPCOM error is to try the basic troubleshooting methods listed in this section.
1. Ailgychwyn 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 ffenestri key, click on the Power button at the bottom-left corner, and click on the Ail-ddechrau opsiwn i ailgychwyn eich cyfrifiadur.
2. Gwiriwch Gysylltiad Rhyngrwyd
An unstable Internet connection may hinder you from using the Firefox browser. You can check the speed of the connection using the Prawf cyflymder 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. Lansio Gosodiadau trwy wasgu Allweddi Windows + I gyda'i gilydd.
2. Cliciwch ar apps gosod.
3. Cliciwch ar Cymwysiadau diofyn ar y cwarel chwith.
4. Scroll down and click on the current Porwr gwe.
5. Choose from the option as per your preference.
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4. Dileu Ffeiliau Dros Dro
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. Atgyweirio Ffeiliau Llygredig
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. Diweddaru 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. Rhedeg Datrys Problemau Diweddariad Windows
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. Perfformio System Adfer
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. Gwasgwch y Allwedd Windows, math firefox a chliciwch ar y Rhedeg fel gweinyddwr opsiwn.
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. Taro'r Allwedd Windows, math Firefox a chliciwch ar agored.
2. Cliciwch ar y Open Application Menu button (indicated by the three horizontal lines) at the top-right corner of the home page and click on the Gosodiadau option on the list displayed.
3. Yn y cyffredinol cliciwch, cliciwch ar y Gwiriwch am ddiweddariadau botwm yn y Diweddariadau Firefox adran hon.
4. Fe welwch y Firefox is up to date message on the Firefox Updates section.
Nodyn: 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. Lansio'r Firefox app gan y Chwilio Windows bar.
2. Nesaf, cliciwch ar y Open Application Menu botwm a chlicio ar y Help option on the list displayed.
3. Cliciwch ar y Troubleshoot Mode… yn y Firefox help ffenestr.
4. Yn awr, cliciwch ar y Ail-ddechrau botwm ar y Ailgychwyn Firefox yn y Modd Datrys Problemau ffenestr naid.
5. Cliciwch ar y Adnewyddwch Firefox botwm ar y Open Firefox in Troubleshoot Mode confirmation window.
6. Yna, cliciwch ar y Adnewyddwch Firefox botwm ar y Refresh Firefox to its default settings ffenestr.
7. Yn olaf, cliciwch ar y Gorffen botwm ar y 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. Agorwch y Mozilla Firefox app gan y Chwilio Windows bar.
2. Cliciwch ar y Open Application Menu botwm a chlicio ar y Help option on the list displayed.
3. Yn awr, cliciwch ar y Troubleshoot Mode… yn y Firefox help ffenestr.
4. Cliciwch ar y agored botwm ar y Ailgychwyn Firefox yn y Modd Datrys Problemau ffenestr naid.
5. Nesaf, cliciwch ar y Open Application Menu botwm a chlicio ar y Ychwanegion a themâu option on the list.
6. Cliciwch ar y Estyniadau tab on the left pane of the next window and toggle oddi ar the add-ons on the window.
7. Yna, cliciwch ar y tri dot llorweddol button on the add-on and click on the Dileu button on the list.
8. Cliciwch ar y Dileu 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. Agorwch y Mozilla Firefox app.
2. Cliciwch ar y Open Application Menu botwm a chlicio ar y Bookmarks option in the list displayed.
3. Yn y Bookmarks ddewislen, cliciwch ar y Rheoli nodau tudalen option at the bottom of the list.
4. Yn y Llyfrgell sgrin, cliciwch ar y 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 y Export Bookmarks File window, browse and select a location, and click on the Save 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. Lansio'r Firefox ap porwr.
2. Math am: proffiliau in the URL address bar at the top and press the Rhowch allweddol i agor y About Profiles ffenestr.
3. Cliciwch ar y Creu Proffil Newydd button on the window.
4. Nesaf, cliciwch ar y Digwyddiadau botwm ar y Welcome to the Create Profile Wizard.
5. Type a name for the Profile in the Rhowch enw proffil newydd maes a chlicio ar y Gorffen button in the window to create the Profile.
Nodyn: Cliciwch ar y 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. Gwasgwch y Allwedd Windows, math panel rheoli a chliciwch ar agored.
2. Click on the option Categori yn y Gweld gan drop-down menu and click on the Dadosod rhaglen opsiwn yn y Rhaglenni pennawd.
3. Dewiswch y Mozilla Firefox (x64 en-US) in the list, click on the Uninstall button at the top of the bar and click on the Ydy botwm ar y ffenestr UAC.
4. Yna, cliciwch ar y Digwyddiadau botwm yn y Mozilla Firefox Uninstall dewin.
5. Nesaf, cliciwch ar y Uninstall button in the next window.
6. Cliciwch ar y Gorffen button on the last window to completely uninstall the Firefox app.
7. Gwasgwch y Windows + E allweddi together to open the File Explorer and navigate to the This PC > Local Disk (C:) > Program Files > Mozilla Firefox ffolder.
8. De-gliciwch ar y Mozilla Firefox ffolder a chliciwch ar y Dileu 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. Taro'r Allwedd Windows, math google chrome a chliciwch ar agored.
Nodyn: You can use any web browser to download the Firefox browser on your PC.
2. agor y wefan swyddogol y Porwr Mozilla Firefox on Google Chrome and click on the Download Firefox button on the window.
3. Double-click on the downloaded executable file Gosodwr Firefox.exe to run the installation file.
4. Wait for the installation process to complete.
5. Lansio'r 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. Agorwch y Firefox app.
2. Cliciwch ar y Open Application Menu botwm a chlicio ar y Gosodiadau option on the list displayed.
3. Yn y cyffredinol cliciwch, cliciwch ar y Gosodiadau… botwm yn y Gosodiadau Rhwydwaith adran hon.
4. Dewiswch y Manual proxy configuration opsiwn ar y Gosodiadau Cysylltiad ffenestr.
5. Math SOCKS Host: 127.0.0.1 Port: 9050 yn y Dirprwy HTTP maes, math 8080 yn y Port field, and click on the OK botwm.
6. Yna, teipiwch Am: config on the search bar of the Firefox browser and click on the Derbyn y Risg a Parhau botwm.
7. Finally, type rhwydwaith.proxy.socks_remote_dns yn y bar chwilio a chliciwch ar y toggle button to set the type of the entry to be yn wir.
8. Yn awr, math https://check.torptoject.org/ in the search bar on the Firefox browser and press the Rhowch key to check the issues with the Tor Browser.
Argymhellir:
The article discusses the methods to fix 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.