Mozilla Firefox can’t load websites but other browsers can

Internet Security software blocking Firefox in Maine

If you were able to load websites until you updated Firefox or until your Internet security software was updated, reconfigured or a new one was added, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet.

In general, you should make sure your Internet security software is up-to-date and remove Firefox from your program’s list of trusted or recognised programs, then add it back.

Mozilla Firefox can't load websites

Firefox connection settings

If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. To check your connection settings in Firefox:

  1. Click the menu button and choose Options.
  2. In the General panel, go down to the Network Proxy
  3. In the Network Proxy section, click Settings….
  4. 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).
  5. Close the Connection Settings dialog.
  6. Close the about: preferences Any changes you’ve made will automatically be saved.

If you find that changes you make to your Firefox connection settings are not remembered when you restart Firefox.

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IPv6

Firefox supports IPv6 by default, which may cause connection problems on certain systems. To disable IPv6 in Firefox:

  1. In the address bar, type about: configand press Enter.
    • The about: config “This might void your warranty!”warning page may appear. Click I accept the risk! To continue to the about: config page.
  2. In the Searchfield, enter dns.disableIPv6.
  3. In the list of preferences, double-click dns. disable IPv6 to set its value to true.

DNS Prefetching

Firefox attempts to speed up loading new websites by using DNS Prefetching, which can cause page load errors with some system configurations. To disable DNS Prefetching:

  1. In the address bar, type about: configand press Enter.
    • The about: config “This might void your warranty!”warning page may appear. Click I accept the risk! To continue to the about: config page.
  2. Right-clickin the list of preferences, select New, and then select Boolean.
  3. In the Enter the preference namefield, enter dns.disablePrefetch and click OK.
  4. Select true when prompted to set the value and click OK.

Firefox cannot load certain websites

If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache:

  1. Click the Library button , click History and select Clear Recent History….
  2. In the Time Range to clear:drop-down, select everything.
  3. Click the arrow next to Detailsto display the list of items that can be cleared.
  4. Select both Cookiesand Cache.
  5. Click Clear Now.

Check for malware

If clearing your cookies and cache did not enable you to load the websites that did not work in Firefox, you should check your computer for malware. Certain types of malware are known to target Firefox and can prevent it from loading various websites:

  • If you have an antivirus or Internet security program, update its detections database and do a full scan of your system.
  • If you still have problems, follow the instructions in Troubleshoot Firefox issues caused by malware.

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Connection settings in Mozilla Firefox

Some simple steps for connection settings in Mozilla Firefox:

Your organisation or Internet service provider may offer or require you to use a proxy. A proxy acts as an intermediary between your computer and the Internet. It intercepts all requests to the Internet to see if it can fulfill the request using its cache. Proxies are used to improve performance, filter requests, and hide your computer from the Internet to improve security. Proxies are often part of corporate firewalls.

Connection settings to use a proxy can be set in Firefox Options as follows:

  1. Click the menu button and choose Options.
  2. In the Generalpanel, go to the Network Proxy
  3. Click Settings…. The Connection Settings dialog will open.
  4. No proxy: Choose this if you don’t want to use a proxy.
  5. Auto-detect proxy settings for this network: Choose this if you want Firefox to automatically detect the proxy settings for your network.
  6. Use system proxy settings: Choose this if you want to use the proxy settings configured for your operating system.
  7. Manual proxy configuration: Choose this if you have a list of one or more proxy servers. Ask your system administrator for the configuration information. Each proxy requires a hostname and a port number.
    • If the same proxy name and port number are used for all protocols, check Use this proxy server for all protocols.
    • No Proxy For: List of hostnames or IP addresses that will not be proxied. Use <local> to bypass proxying for all hostnames which do not contain periods.
  8. Automatic proxy configuration URL: Choose this if you have a proxy configuration (.pac) file. Enter the URL and click okay to save changes and load the proxy configuration.
    • Reload: The reload button will load the currently available proxy configuration.

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