https://support.mozilla.com/en-US/kb/Options+window+-+Advanced+panel#Network_tab

If you don't need to use a proxy, change the setting to No proxy.

In addition to what the-edmeister posted above:

In Firefox 3.6.4 the default connection settings have been changed to "Use the system proxy settings". See #Firefox_connection_settings|Firefox connection settings

You can find the connection setting here: Tools > Options > Advanced : Network : Connection If you do not need to use a proxy to connect to internet then select No Proxy

Thank you cor-el and terry. "Tools > Options > Advanced : Network : No Proxy" just worked perfectly for me on HP with Windows XP!

I was unable to access the Internet on my host PC (since mid-July '10), but the wireless access via my laptop was working. With cor-el and terry suggestion, my Firefox has resumed operations!!!

Thanks-Thanks-Thanks,

helpedbyu

Hey had the same problem and after reading this it seemed too easy. Thank you very much for taking the time to respond because it helped me and I didn't have to wait for a post bc it was already answered.

I have changed my settings to no proxy and every time I reboot Firefox, it goes back to the old setting and I have to no proxy again.

I spent more time setting up an account on here just so I could reply to you. I actually spent more time setting up my account then I did following your advice to resolving the firefox issue I had (that obviously other peopl ehave too). You gave such a simple solution.. It literaly took seconds to fix this problem that has plauged me for over a week! Thank you so much

If the connection setting aren't kept after a restart then check for an overriding user.js in the Firefox Profile Folder.
There are also extensions that can change the connection settings.

• http://kb.mozillazine.org/Preferences_not_saved

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

See:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

In my case, I had an add-on called "Password Exporter" that was setting Firefox to a local proxy on startup.

I uninstalled it and now everything is working again.