Are you having trouble getting a website to load? Don't worry — we're here to help. This article will show you how to fix the problem so you can get back to surfing the web.

Nota: se estiver a ter problemas com um site, clique no ícone do cadeado na barra de endereço para confirmar se o Firefox bloqueou partes da página que não sejam seguras. Consulte Bloqueio de conteúdo misto no Firefox para detalhes.

First, let's figure out where the problem is

With a little detective work, we can narrow down the cause of the problem.

1. Open a new tab and check to see if you can load another website like google.com or mozilla.org.
   • If you can open another site, skip down to The problem only happens with certain websites
   • If you can't open another site, continue on to the next step.
2. Launch another browser, like Internet ExplorerSafariGoogle Chrome, and try to open the site you were having problems with.
   • If the site works in another browser, see The problem only happens in Firefox
   • If the site doesn't work in another browser, check out The problem happens in all web browsers

The problem only happens with certain websites

If you see any of these error messages, it might just be a problem with Firefox's cache:

• The connection was interrupted
• The connection was reset
• The connection has timed out

Try clearing Firefox's cookies and cache

Do these steps and then reload the website you're having trouble with.

If clearing Firefox's cookies and cache didn't work, it's probably a sign that there is a problem with the website itself. In that case you'll just have to wait for it to get fixed. With big sites like Twitter or Facebook this may only be a few minutes.

If you don't see any of the error messages above, check to see if any of the specific problems below match what you see:

The website loads but doesn't work properly

If the website doesn't look right or doesn't work the way it's supposed to, you should check out the following articles:

The problem only happens on a secure (https) website

Look at the web address in the location bar. Does it start with https:// (notice the "s")? If so, check if you see one of the following error messages. Click on the error message to find the solution for it:

• Páginas de erro de ligação segura e aviso de segurança no Firefox
• Fix the "Could not initialize the application's security component" error message

The problem only happens in Firefox

If another web browser works just fine, one of following solutions should fix things:

• O Firefox não consegue carregar os ''sites'' da Web, mas os outros navegadores podem - if you can view websites in browsers other than Firefox.
• Corrigir problemas de ligação aos ''sites'' da Web depois de atualizar o Firefox - if you experience connection problems after updating Firefox.

If you see the following error messages, Firefox is trying to access the internet through a proxy server :

• The proxy server is refusing connections
• Unable to find the proxy server

To check your proxy settings:

1. Na barra do "Menu" no topo do ecrã, clique em Firefox e selecione Definições (selecione Preferências nas versões mais antigas do macOS).Clique no botão Menu e selecione Definições.
2. Select the Advanced panel.
3. Select the Network tab.
4. In the Connection section, click Settings....
5. Change your proxy settings:
   • If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy.
   • If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (such as Internet Explorer — see Microsoft's guide to proxy settings)(such as Safari — see Safari: Set up a proxy server).
6. Close the Connection Settings window.
7. Feche a página das Definições. Quaisquer alterações efetuadas serão guardadas automaticamente.

The problem happens in all web browsers

This is probably a problem with your internet connection. See Firefox e outros navegadores não conseguem carregar websites for some troubleshooting suggestions.

Other, less common problems

• A website reports that Firefox is outdated, incompatible, or not supported - See Como repor o agente de utilizador predefinido no Firefox.
• A plugin has crashed - This means that a plugin which is being used to display content on the current page has unexpectedly quit. See Enviar relatórios de craches de ''plug-ins'' para ajudar a Mozilla a melhorar o Firefox for more information.
• Malicious website errors - If you see a "Suspected Attack Site!" or "Suspected Web Forgery!" warning, Firefox has blocked access to the website you're visiting to protect you from malware or web forgery (phishing). For more information, see Phishing and Malware Protection (Mozilla.org).
• Offline mode - If you see a message about offline mode, you may have set Firefox not to use your network connection. Make sure your computer has a network connection and then:
  • At the top of the Firefox window,On the menu bar, click on the File menu and make sure that Work Offline is unchecked.Press the Alt key to temporarily turn on the Menu Bar, click on the File menu (Windows XP, just click on the File menu) and make sure that Work Offline is unchecked.Click the menu button , click Developer and make sure Work Offline is unchecked.
• The page isn't redirecting properly - This problem can be caused by problems with cookies. See Os ''sites'' da Web dizem que os ''cookies'' estão bloqueados - Desbloqueá-los for more information.
• If you get a File not found error, try the troubleshooting steps in these articles:
  • Resolução de problemas para extensões, temas e aceleração por "hardware" para resolver problemas comuns do Firefox
  • Resolver problemas no Firefox causados por programas maliciosos (Malware)
• Content Encoding Error - If you get the error message, Content Encoding Error or The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression, use these steps to diagnose and fix them:
  1. Check the settings of any Internet security applications you use (including firewalls, anti-virus or anti-spyware programs, and privacy protection programs). You should try to remove any permissions those applications have for Firefox, and then add them again. For program-specific instructions for a number of applications, see Configurar as ''firewalls'' para que o Firefox consiga aceder à Internet.
  2. Follow the Standard troubleshooting steps.
• This address is restricted - This error occurs when you are attempting to connect to a web server on a port that is reserved for another application. If the website you are trying to visit contains a colon followed by a number in its address (for example, http://website.com:23), try removing that portion (http://website.com) or replacing it with :80 (http://website.com:80). If this doesn't work, you may have been given an incorrect address.

Based on information from Error loading websites (mozillaZine KB)