Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I downloaded Firefox 3.6.3 and now Mozilla won't start at all. What happened?

  • 1 reply
  • 4 have this problem
  • 141 views
  • Last reply by Morbus

I downloaded Firefox 3.6.3.exe, opened it, it appeared on my Start menu. I click the icon there and nothing happens. Absolutely no connection.

I downloaded from the Mozilla home page this a.m.

User Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; Media Center PC 4.0; WWTClient2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

I downloaded Firefox 3.6.3.exe, opened it, it appeared on my Start menu. I click the icon there and nothing happens. Absolutely no connection. == I downloaded from the Mozilla home page this a.m. == == User Agent == Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; Media Center PC 4.0; WWTClient2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

All Replies (1)

Hello.

Hopefully this support article is what you need:

https://support.mozilla.com/en-US/kb/Firefox+will+not+start