Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Lees voor meer informatie dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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I need to run both Firefox 3 and Firefox 4, how do I do that?

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  • Laatste antwoord van the-edmeister

FrogLace
FrogLace
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I do web coding (html/css) and need to be able to test in both versions of Firefox.

When I installed 4 it rendered 3 non working even though I installed in a new folder.

Is there any way to run both versions?

I do web coding (html/css) and need to be able to test in both versions of Firefox. When I installed 4 it rendered 3 non working even though I installed in a new folder. Is there any way to run both versions?

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FrogLace
FrogLace Vraageigenaar
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found my answer.... what a pain in the a$$!

WardC
WardC
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I'm ready for the pain. What's the answer?

FrogLace
FrogLace Vraageigenaar
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Most of the answer is here: http://www.thewindowsclub.com/how-to-run-firefox-3-and-firefox-4-simultaneously-in-windows

But I did need to reinstall FF3.6 after I set everything up.

For my own sanity, I created desktop shortcuts with different icons.

I have not tried to open both at the same time as I have no need to do so.

Hope that helps.

the-edmeister
the-edmeister
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If you don't need to run both versions simultaneously see this for a more simple way.

http://forum.thewindowsclub.com/windows-tips-tutorials-articles/31644-easy-way-use-both-firefox-3-4-easily-switch-between-them.html