Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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 installed and reinstalled Firefox 4.01 several times, but when I open it, Firefox 3.6 opens instead.

more options

I downloaded and installed Firefox 4.01. I even uninstalled Firefox 3.6 and reinstalled 4.01. When I click the finish button 4.01 opens, but once I close the browser and then open it from my start menu or desktop icon 3.6 opens instead. What's the problem?

I downloaded and installed Firefox 4.01. I even uninstalled Firefox 3.6 and reinstalled 4.01. When I click the finish button 4.01 opens, but once I close the browser and then open it from my start menu or desktop icon 3.6 opens instead. What's the problem?

All Replies (3)

more options

What makes you think that you don't have Firefox 4.0.1 installed?
This forum shows you used Firefox 4.0.1 to post here - different PC?

more options

When I open Mozilla the page days I'm running 3.6.13 and recommends I download 4.0

more options

Please provide a screenshot of that message.

https://support.mozilla.com/en-US/kb/Adding+screenshots