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About 9% of my website's users are still on Firefox 3.6. While encouraging them to upgrade, I still need to test that the website looks presentable in 3.6, but I have Firefox 6 installed on my computer (Windows 7 x64).

Is it safe to install Firefox 3.6 without it interfering with my existing Firefox 6 installation?

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as he said it is hectic use ff portable .. i tried a dual install and ended up being sorry .. – HackToHell Sep 10 '11 at 10:31
up vote 4 down vote accepted

No, there is the possibility/likelihood(?) of problems.

My suggestion is that you download the portable versions of Firefox. You can find older versions at the bottom of that page.

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No need for portable. Just copy your profile and use profile manager to use FF 3.6 and 6 or whatever version you need.

Fire up with "-no-remote" to run second version of Firefox side by side.

Examples:

Run along other version and open Profile Manager at startup:

somepath\firefox.exe -ProfileManager -no-remote

Run along other version and open with a profile named "FF3":

somepath\firefox.exe -P "FF3" -no-remote

Run along other version and open with a profile named "default":

somepath\firefox.exe -P "default" -no-remote
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You can also look at application virtualization with something like Thinapp, App-V, Cameyo or any number of others.

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