Gak tahu kenapa tiba-tiba browser mozilla di laptop ini tidak bisa akses google. Kejadiannya persis saat ada problem wifi yang tiba-tiba berpindah sendiri ke channel sebelumnya. Simak artikel yang saya kopas langsung dari sebelah 🙂

This article describes problems where Firefox cannot load websites, but other web browsers (such as Internet Explorer) can. When this happens, Firefox may show a Server not found or Unable to connect error message.

• For other error messages that display when you 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 can load websites, see Firefox and other browsers can’t load websites.

Internet Security software blocking Firefox

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 recognized programs, then add it back. For instructions on how to configure some programs, see the Configure firewalls so that Firefox can access the Internet article.

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 Firefox proxy settings:

1. Click the menu button and choose Options.

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).
6. Close the Connection Settings window.
7. Close the about:preferences page. 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, see 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:

1. In the address bar, type about:config and 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 Search field, type network.dns.disableIPv6.
3. In the list of preferences, double-click network.dns.disableIPv6 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:config and 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-click in the list of preferences, select New, and then select Boolean.
3. In the Enter the preference name window, enter network.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:

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.

Sumber:

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can