Are you using a bookmark or does this also happen if you type the URL in the location bar?

Can you access this website in Private Browsing mode (Firefox/File > New Private Window)?

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 a note of those passwords and bookmarks.

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

problem occurred when type url or google search and shoot.

Did the History forget, to no avail.

Also get same error message via Private Browsing. KW

Can you open the page via Google Translate with a random source language?

• http://translate.google.com/translate?hl=en&sl=fr&tl=en&u=http://www.gemut.com

You can try to reset (power off/on) the router.

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

problem remains

Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox