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- Outdated Firefox- The outdated version of the Firefox app may cause this error.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 solução 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 chave, clique no botão Potência button at the bottom-left corner, and click on the Reiniciar opção para reiniciar o seu PC.
2. Verifique a conexão com a Internet
An unstable Internet connection may hinder you from using the Firefox browser. You can check the speed of the connection using the Teste 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. Lançamento Configurações pressionando Teclas Windows + I juntos.
2. Clique em Apps criação.
3. Clique em Aplicativos padrão no painel esquerdo.
4. Scroll down and click on the current Browser.
5. Choose from the option as per your preference.
Leia também: Como consertar o Firefox que não carrega páginas
4. Exclua os arquivos temporários
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. Repare arquivos corrompidos
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. Atualize o 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. Execute o solucionador de problemas do 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. Execute a restauração 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.
Leia também: Fix Your Connection is not Secure Error on Firefox
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. aperte o Tecla do Windows, Tipo firefox e clique no Executar como administrador opção.
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. Aperte o Tecla do Windows, Tipo Firefox e clique em Abra.
2. Clique no ícone Open Application Menu button (indicated by the three horizontal lines) at the top-right corner of the home page and click on the Configurações opção na lista exibida.
3. No Geral guia, clique no Verificar atualizações botão no Atualizações do Firefox seção.
4. Você verá o Firefox is up to date message on the Firefox Updates section.
Observação: 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. Inicie o Firefox app do Pesquisa do Windows Barra.
2. Em seguida, clique no Open Application Menu botão e clique no Ajuda opção na lista exibida.
3. Clique no ícone Modo de solução de problemas… no Firefox help janela.
4. Agora, clique no Reiniciar botão no Reinicie o Firefox no modo de solução de problemas janela de pop-up.
5. Clique no ícone Reiniciar Firefox botão no Open Firefox in Troubleshoot Mode confirmation window.
6. Em seguida, clique no Reiniciar Firefox botão no Refresh Firefox to its default settings janela.
7. Por fim, clique no Acabamento botão no Importação concluída window to Refresh Firefox completely.
Leia também: Fix Server Not Found Error in Firefox
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. Abra a Mozilla Firefox app do Pesquisa do Windows Barra.
2. Clique no ícone Open Application Menu botão e clique no Ajuda opção na lista exibida.
3. Agora, clique no Modo de solução de problemas… no Firefox help janela.
4. Clique no ícone Abra botão no Reinicie o Firefox no modo de solução de problemas janela de pop-up.
5. Em seguida, clique no Open Application Menu botão e clique no Complementos e temas opção na lista.
6. Clique no ícone Extensões tab on the left pane of the next window and toggle WOW! the add-ons on the window.
7. Em seguida, clique no três pontos horizontais button on the add-on and click on the Eliminar botão na lista.
8. Clique no ícone 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. Abra a Mozilla Firefox app.
2. Clique no ícone Open Application Menu botão e clique no Bookmarks option in the list displayed.
3. No Bookmarks cardápio, clique no botão Gerenciar favoritos opção no final da lista.
4. No Biblioteca tela, clique no Importação e de backup button at the menu bar and click on the Exportar favoritos para HTML option in the drop-down menu displayed.
5. No Export Bookmarks File window, browse and select a location, and click on the Salvar 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. Inicie o Firefox aplicativo do navegador.
2. Tipo sobre: perfis in the URL address bar at the top and press the Entrar chave para abrir o About Profiles janela.
3. Clique no ícone Crie um novo perfil botão na janela.
4. Em seguida, clique no Próximo botão no Welcome to the Create Profile Wizard.
5. Type a name for the Profile in the Insira o novo nome do perfil campo e clique no Acabamento button in the window to create the Profile.
Observação: Clique no Choose Folder… button to change the location for storing the User Profile name instead of the default location.
Leia também: Corrigir o Firefox já está em execução
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. aperte o Tecla do Windows, Tipo painel de controle e clique em Abra.
2. Clique na opção Categoria no Ver por drop-down menu and click on the Desinstalar um programa opção no Programas encabeçando.
3. Selecione a Mozilla Firefox (x64 en-US) in the list, click on the Desinstalar button at the top of the bar and click on the Sim botão na janela do UAC.
4. Em seguida, clique no Próximo botão no Desinstalar Mozilla Firefox assistente.
5. Em seguida, clique no Desinstalar button in the next window.
6. Clique no ícone Acabamento button on the last window to completely uninstall the Firefox app.
7. aperte o Janelas + E chaves together to open the File Explorer and navigate to the This PC > Local Disk (C:) > Program Files > Mozilla Firefox pasta.
8. Clique com o botão direito do mouse no Mozilla Firefox pasta e clique no botão Apagar 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. Aperte o Tecla do Windows, Tipo Google Chrome e clique em Abra.
Observação: You can use any web browser to download the Firefox browser on your PC.
2. Abra o site oficial do Navegador Mozilla Firefox on Google Chrome and click on the Baixe Firefox botão na janela.
3. Double-click on the downloaded executable file Instalador do Firefox.exe to run the installation file.
4. Aguarde a conclusão do processo de instalação.
5. Inicie o Firefox Web Browser app on your PC.
Leia também: Fix No Sound in Firefox on Windows 10
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. Abra a Firefox app.
2. Clique no ícone Open Application Menu botão e clique no Configurações opção na lista exibida.
3. No Geral guia, clique no Configurações… botão no Configurações da rede seção.
4. Selecione a Configuração manual de proxy opção no Configurações de conexão janela.
5. Tipo SOCKS Host: 127.0.0.1 Port: 9050 no Proxy HTTP tipo de campo 8080 no Porta field, and click on the OK botão.
6. Em seguida, digite Sobre: config on the search bar of the Firefox browser and click on the Aceite o risco e continue botão.
7. Finally, type rede.proxy.socks_remote_dns na barra de pesquisa e clique no alternancia button to set the type of the entry to be verdadeiro.
8. Agora, digite 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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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.