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This article describes problems where Firefox cannot load websites but other Web browsers (such as Internet Explorer or Microsoft Edge Safari Epiphany on Gnome or Konqueror on KDE) can. When this happens, Firefox may show a Server not found or Unable to connect fault message.

For other error letters that display when y'all try to view websites in Firefox, see Websites don't load - troubleshoot and fix error messages.
If none of the Web browsers on your computer tin can load websites, see Firefox and other browsers can't load websites.

Tabular array of Contents

ane Internet Security software blocking Firefox
ii Firefox connexion settings
3 IPv6
iv DNS Prefetching
5 Firefox cannot load certain websites
- 5.1 Bank check for malware
6 Bank check if an extension is causing the problem

Internet Security software blocking Firefox

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

Note: Some Net security programs can block Internet access even when they are in a "disabled" country.

In general, you should make certain your Net security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add information technology back. For instructions on how to configure some programs, meet the Configure firewalls so that Firefox tin access the Internet commodity.

Firefox connection settings

If you connect to the Internet through a proxy server that is having connection issues, you lot will non be able to load websites. To check your connection settings in Firefox:

In the Menu bar at the superlative of the screen, click and select . Click the carte push button and select . Click the card button and select .
In the panel, go down to the Network Settings section.
In the Network Settings section, click Settings….
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 y'all connect to the Internet through a proxy, compare Firefox'due south settings to some other browser's (such as Internet Explorer — see Microsoft's guide to proxy settings) (such as Safari — depending on your Os Ten version, see Mac Os X x.6: Enter proxy server settings, Bone X Lion: Enter proxy server settings, or Os Ten Mountain King of beasts: Enter proxy server settings).
Close the Connection Settings dialog.
Close the virtually:preferences page. Any changes you lot've made will automatically be saved.

If you notice that changes yous make to your Firefox connectedness settings are not remembered when you restart Firefox, run into How to fix preferences that won't save.

IPv6

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

Type about:config in the address bar and press Enter Return .
A alarm page may appear. Click Accept the Gamble and Continue to go to the most:config folio.
In the Search field, enter network.dns.disableIPv6.
In the listing of preferences, click the Toggle push next to network.dns.disableIPv6 to gear up its value to truthful.

DNS Prefetching

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

Type almost:config in the address bar and press Enter Return .
A warning folio may appear. Click Accept the Risk and Continue to go to the about:config page.
Enter the preference proper name network.dns.disablePrefetch in the about:config search bar.
- If the preference doesn't already be, select Boolean and click the Add push button.
Press the Toggle button to set up the preference value to true, if it's not already set.

Firefox cannot load certain websites

If you discover that Firefox can load some websites merely not others, beginning articulate your Firefox cookies and enshroud:

Click on the bill of fare button to open up the menu panel. Click the Library push on your toolbar. (If you don't see information technology, click the menu button, and so click click the carte du jour button.)
Click and select .
In the Time Range to articulate: drop-downward, select Everything.
Below the driblet-down card, select both Cookies and Cache. Make certain other items you want to keep are non selected.
Click OK.

Bank check for malware

If clearing your cookies and cache did not enable you to load the websites that did not piece of work in Firefox, yous should bank check your estimator for malware. Certain types of malware are known to target Firefox and can forestall information technology from loading various websites:

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

Check if an extension is causing the problem

A Firefox extension could be causing the result, especially the ones that have network access and/or those that rely on manipulating webpage content. Effort disabling your extensions in the Add-ons Manager one past one so reload the page. See Disable or remove Add-ons and Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems for more than information.

Brock Casim1995

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