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Cannot open google or mozilla sites in firefox ok in other browsers.

  • 10 replies
  • 28 have this problem
  • Last reply by Psylocke

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I am running Firefox 36 which runs normally except that I cannot open certain websites a few eg.s below:

any mozilla sites, cannot open extention site also no Google sites

which is very fustrating. The above websites work in IE, Chrome & Opera. I have cleared cache and cookies, reloaded in safe mode, totally

uninstalled firefox and cleaned out any reference to Firefox or Mozilla in my registry and after reinstalling no change. I have even downgraded

to version 34 to no avail. I am using Kaspersky anti virus which I have tried closing down and I cannot see any problems with Windows firewall.

After looking on your webiste I also tried disabling IPv6 & changing DNS Prefetching (about:config).f

This problem first occured approx 5 days ago I am at a loss as to why this is happening, please can you advise.

Chosen solution

All working fine now.

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All Replies (10)

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did you try deleting the firefox profile in AppData folder?

if you can't reach that page, here is the money quote:

click the Windows Start button and type %APPDATA%, delete mozilla folder there. Note, it has to be all caps.

Modified by crislevin

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Yes i did sorry forgot to mention.

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This seems beyond firefox, I understand you mention there is no problem with windows firewall, but just for diagnose purposes, can you turn firewall off and see if it helps?

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Just tried your suggestion to no avail. Any further suggestions gratefully appreciated, cheers crislevin.

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At this time, I don't have any good ideas, but please provide a bit more information so I or others can help further:

  1. when you type in the url and press enter, in the bottom left of the browser window, it will have some status notification, it maybe "looking up..." "connecting..." "waiting for response...", "transferring data...", what was the status you get when trying to reach those websites?
  2. when you say "can't open", what error page shows up?
  3. if you can't open can you open ? (this is the ip address of, using this directly should bypass DNS issues).
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The crazy thing is there is no error message it simply accepts the google url momentarily says connecting on the above tab & then quickly blanks out and reverts to the original page. It's as if it's not even trying to resolve the url. Cache & cookies have been cleared. worked fine, good thinking, but tried typing which is and the same problem occurred. But it does indicate a DNS problem would you agree ?

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Possibly. It is hard to understand why other browsers are fine though.

Two things to try:

1. check firefox's options->advanced->network->connections, it should be "use system proxy settings", nothing else should be checked.

2. if above is good, try goto windows TCP/IP settings, and manually add a third part DNS, there are many you can use, check here

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Hi crislevin, I have tried the above to no avail, I've decided to re-install windows because I've been having a few niggling problems there also.

Most of my data is on external drives so it will not be to much trouble. Thanks for all your help.


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Okies, sorry couldn't figure out in the end. If you still plan to install firefox, you can set up a sync to get all your bookmarks/passwords/history/addon to back up, then reinstall windows.

Good luck!

Modified by crislevin

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Chosen Solution

All working fine now.