So if you search through the Google home page it works or it gives the same error? Note that I mean the secure version of the home page:

https://www.google.com/

Is there anything special about the way your Firefox connects to the internet? By that I mean:

• Do you use a proxy server?
• Do you use a private VPN service or TOR?
• Do you have security software that filters your connections (such as BitDefender, ESET, Kapsersky or newer versions of avast!)?

In a previous thread about not being able to access Gmail for the same reason, the user reported that reinstalling Firefox resolved the issue. Here's how I suggest doing that if you want to try it:

Clean Reinstall

We use this name, but it's not about removing your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. Do NOT uninstall Firefox, that's not needed.

(1) Download a fresh installer for Firefox 38.0.5 from https://www.mozilla.org/firefox/all/ to a convenient location. (Scroll down to your preferred language.)

(2) Exit out of Firefox (if applicable).

(3) Rename the program folder:

(64-bit Windows folder names)

C:\Program Files (x86)\Mozilla Firefox

to

C:\Program Files (x86)\OldFirefox

(32-bit Windows folder names)

C:\Program Files\Mozilla Firefox

to

C:\Program Files\OldFirefox

(4) Run the installer you downloaded in #1. It should automatically connect to your existing settings.

Will a cleanly reinstalled Firefox load Google correctly?

Note: Some plugins may exist only in that OldFirefox folder. If something essential is missing, look in these folders:

• \OldFirefox\Plugins
• \OldFirefox\browser\plugins

Hi thejscher2000 said

In a previous thread about not being able to access Gmail for the same reason, the user reported that reinstalling Firefox resolved the issue. Here's how I suggest doing that if you want to try it: Clean Reinstall We use this name, but it's not about removing your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. Do NOT uninstall Firefox, that's not needed. (1) Download a fresh installer for Firefox 38.0.5 from https://www.mozilla.org/firefox/all/ to a convenient location. (Scroll down to your preferred language.) (2) Exit out of Firefox (if applicable). (3) Rename the program folder: (64-bit Windows folder names) C:\Program Files (x86)\Mozilla Firefox to C:\Program Files (x86)\OldFirefox (32-bit Windows folder names) C:\Program Files\Mozilla Firefox to C:\Program Files\OldFirefox (4) Run the installer you downloaded in #1. It should automatically connect to your existing settings. Will a cleanly reinstalled Firefox load Google correctly? Note: Some plugins may exist only in that OldFirefox folder. If something essential is missing, look in these folders:

• \OldFirefox\Plugins
• \OldFirefox\browser\plugins

Hi there. I'm using BitDefender yes. I just deleted BitDefender and installed a different anti-virus, Kaspersky. The problem seems to be resolved, thanks a lot for your help!

Note that your System Details List shows multiple Flash plugins.

1. Shockwave Flash 11.8 r800
2. Shockwave Flash 11.9 r900
3. Shockwave Flash 12.0 r0
4. Shockwave Flash 18.0 r0

You can find the installation path of all plugins on the about:plugins page.

• http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins

You can check the Flash player installation folder for multiple Flash player plugins and remove older version(s) of the plugin (NPSWF32) and possibly (re)install the latest Flash player.

• (32 bit Windows) C:\Windows\System32\Macromed\Flash\
• (64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page.

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of the involved files.

It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.