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How can I install an older version of FireFox to test our site?


I am in QA for SimpleTuition. We get feedback about showing hidden fields on older versions of Firefox, but I cannot test the fix on the current version. I need to install Firefox 5.?

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  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0) Gecko/20100101 Firefox/6.0

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David McRitchie 321 solutions 3089 answers

Helpful Reply

For those that really need to test an earlier version of Firefox, find your system and the Firefox version you want in releases, download and start the install.

Users should be on either 3.6.21 or 6.0.2

Changed response because poster wanted Firefox 5 so response for 3.6.21 is not


Modified by David McRitchie

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10779 solutions 97012 answers

The latest Firefox 3.6.x version is 3.6.22

Do a custom install and install each version in its own program folder to use multiple Firefox versions.

Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.

See these mozillaZine KB articles for information: