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

can I install versions 3 and 4 on my PC at the same time?

  • 3 replies
  • 10 have this problem
  • 5 views
  • Last reply by ronpat111

more options

web page developer.

Can I install and run versions 3 and 4 on my PC at the same time? If so, how?

Chosen solution

In theory it is possible. I haven't tried this myself since 3.5 came out, so I don't know whether it works the same with 4.

You need to install Firefox 3.6 and Firefox 4 to different program folders, and you need to create another profile under a different name (two running instances of Firefox cannot share a single profile). Finally, you want to edit your shortcuts to point to different profiles, and one of them should have the -no-remote startup switch.

More info:

Opening a new instance of your Mozilla application with another profile - MozillaZine Knowledge Base

is it possible to run both firefox 3 and 4 in the same computer (windows) | Firefox Support Forum | Firefox Help

How run Version 4 and Version 3 simultaneously? • mozillaZine Forums

Read this answer in context 👍 2

All Replies (3)

more options

Chosen Solution

In theory it is possible. I haven't tried this myself since 3.5 came out, so I don't know whether it works the same with 4.

You need to install Firefox 3.6 and Firefox 4 to different program folders, and you need to create another profile under a different name (two running instances of Firefox cannot share a single profile). Finally, you want to edit your shortcuts to point to different profiles, and one of them should have the -no-remote startup switch.

More info:

Opening a new instance of your Mozilla application with another profile - MozillaZine Knowledge Base

is it possible to run both firefox 3 and 4 in the same computer (windows) | Firefox Support Forum | Firefox Help

How run Version 4 and Version 3 simultaneously? • mozillaZine Forums

more options

Yes, this setup works with Firefox 4 for me.

more options

Thank you very much. I appreciate the very quick response and the additional resource links. Excellent help!